May 2027 observances

Calan Mai

Welsh seasonal folk tradition associated with the traditional beginning of summer

Museum Wales and Wales.com identify Calan Mai on 1 May as a traditional Welsh seasonal celebration associated with the beginning of summer and regionally varied folk customs.

Constitution Day

Republic of the Marshall Islands / national Constitution Day

Republic of the Marshall Islands parliamentary and diplomatic sources verify May 1 Constitution Day, the Constitution’s May 1, 1979 parliamentary commencement date, and current national-hol…

Global Love Day

organizer-led global compassion and human-connection observance

The Love Foundation states that the first Global Love Day was presented on May 1, 2004 and maintains the annual observance through current 2026 material.

International Doodle Dog Day

International / creator-led doodle-dog community observance

The official International Doodle Dog Day site states that doodle dog lovers celebrate every year on May 1 and identifies Jeannie North as the founder.

International Sunflower Guerrilla Gardening Day

International / guerrilla-gardening community observance

GuerrillaGardening.org documents International Sunflower Guerrilla Gardening Day on 1 May and says Brussels guerrilla gardeners declared it in 2007.

Keep Kids Alive Drive 25 Day

United States / Keep Kids Alive Drive 25 road-safety campaign

Keep Kids Alive Drive 25 identifies May 1 as KKAD25 Day and describes the 2026 observance as its 20th annual nationwide proclamation effort.

Labor Day (Philippines)

Philippine regular holiday

Supreme Court E-Library / official presidential proclamation

Law Day, U.S.A.

United States patriotic and national observance

United States Code, title 36 §113

Lei Day

Hawaiʻi cultural observance recognized by the state

State of Hawaiʻi Department of Land and Natural Resources / state law history

Loyalty Day

United States patriotic and national observance

United States Code, title 36 §115

May Day / International Workers’ Day

International labour movement observance; public-holiday status varies by country

The International Labour Organization marks May Day on 1 May and publishes current worker-focused material.

National Black Barber Shop Appreciation Day

United States / creator-registered Black barber and barber-shop appreciation observance

National Day Archives attributes the May 1 observance to James Jean-Pierre, created in April 2021; University of Georgia Extension independently recognizes the date in community-health educ…

National Explosive Ordnance Disposal Day

U.S. recognition and memorial context for explosive ordnance disposal personnel

H.Res.1294 and the House roll-call record support designation of the first Saturday in May as National Explosive Ordnance Disposal Day; EOD Warrior Foundation material confirms the current…

National Fitness Day

United States / National Fitness Day organization

The National Fitness Day organization states that the observance started in 2017 and is celebrated on the first Saturday of May in the United States.

National Mother Goose Day

United States-origin literary and nursery-rhyme observance

A New York State Senate resolution states that Gloria T. Delamar founded Mother Goose Day in 1987 alongside publication of Mother Goose: From Nursery to Literature and memorialized May 1 as…

National Purebred Dog Day

United States / dog-community recognition

The American Kennel Club identifies 1 May as National Purebred Dog Day and its May 2026 Gazette explicitly celebrates the date.

National Rotate Your Beer Day

United States / informal beer-retail observance

National Day Archives records National Rotate Your Beer Day on May 1 and attributes it to Superior Beverage Group, while Days Of The Year independently places it on May 1.

National Scrapbook Day

Scrapbooking community / Creative Memories-origin observance

Creative Memories states that the first Saturday in May is National Scrapbook Day and continues to publish current NSD materials; its history identifies Creative Memories as the originator.

National Start Seeing Monarchs Day

United States / monarch-butterfly awareness observance

The City of Hoboken recognized 2 May 2026 as National Start Seeing Monarchs Day, while the current observance registry gives the reusable rule as the first Saturday of May.

Pilates Day / International Pilates Day

International Pilates professional-community observance

The Pilates Method Alliance maintains the current first-Saturday-in-May Pilates Day campaign; USPTO records document PMA use of PILATES DAY in November 2003, while the exact first public ce…

Wildfire Community Preparedness Day

United States and Canada / NFPA preparedness campaign

NFPA’s 2026 fact sheet states that the campaign was piloted in Colorado in 2013, is managed by NFPA, and is held in the United States and Canada on the first Saturday in May; the 2026 date…

World Naked Gardening Day

International grassroots gardening/body-acceptance observance

The Naturist Education Foundation hosts current World Naked Gardening Day information, verifies the 10 September 2005 inaugural edition and historical date transitions, and states that the…

International Bereaved Mother’s Day

International grief/remembrance observance for mothers whose children have died

Founder Carly Marie’s published account states that International Bereaved Mother’s Day was created in 2010 and is held on the first Sunday of May; current bereavement organizations observe…

International Dawn Chorus Day

The Wildlife Trusts / international nature-listening participation

The Wildlife Trusts identifies International Dawn Chorus Day on the first Sunday in May and describes the celebration of birdsong at dawn

National Life Insurance Day

United States / Liran Hirschkorn-created life-insurance awareness observance

National Day Calendar identifies Liran Hirschkorn as the 2014 submitter and May 2 as the recurring private observance date; exact first public edition remains unresolved.

Polish National Flag Day / National Flag Day of the Republic of Poland

Poland / national flag observance

Poland’s Act of February 20, 2004 inserted Article 6a establishing May 2 as Flag Day of the Republic of Poland. Current government material continues the May 2 observance and explains its h…

World Laughter Day

Laughter Yoga International-created global community observance

Laughter Yoga International states that Dr. Madan Kataria created World Laughter Day in 1998, with the first gathering in Mumbai; its current recurrence is the first Sunday of May.

World Tuna Day

United Nations / international observance

A/RES/71/124

Constitution Memorial Day

Japan / national holiday

Japan’s current government holiday guidance identifies Constitution Memorial Day on 3 May, explains that it commemorates the Constitution taking effect on 3 May 1947, and states that the ho…

Día de la Cruz

El Salvador cultural-religious tradition

El Salvador Ministry of Culture repeatedly documents Día de la Cruz on May 3 as a living syncretic Salvadoran cultural-religious tradition with Christian, Indigenous and agricultural elemen…

Melanoma Monday®

American Academy of Dermatology U.S. skin-cancer awareness campaign

The American Academy of Dermatology states that it launched Melanoma Monday® on 1 May 1995, has observed it every year since, and holds it on the first Monday in May as the opening of its U…

National Montana Day

United States / National Day Calendar National State Days series — Montana

National Day Calendar lists National Montana Day on 3 May. The U.S. Senate records Montana’s admission/statehood date as 8 November 1889. The two dates are deliberately kept separate so the…

National SAN Architect Day

United States / KCI, Inc.-submitted professional recognition observance

National Day Calendar states that KCI, Inc. founded/submitted National SAN Architect Day and that the Registrar proclaimed it to be observed annually on May 3.

National Specially-Abled Pets Day

United States-origin / creator-led disabled-pet awareness observance

National Day Calendar records May 3 as National Specially-Abled Pets Day and attributes its founding to animal advocate Colleen Paige; archived creator material is also referenced by indepe…

Wild Koala Day

International / wild-koala conservation and habitat-awareness observance led by a network of Australian koala conservation groups

Wild Koala Day first-party material fixes the observance on May 3, documents its beginning in 2016 through a network of koala conservation groups, and continues to organize current annual p…

World Press Freedom Day

UNESCO / United Nations international observance

UNESCO 26 C/Resolution 4.3

Firefighters’ Memorial Day

United Kingdom / firefighters remembrance

The Firefighters Memorial Trust says Firefighters’ Memorial Day is marked each year on 4 May to remember firefighters who have died in service.

Greenery Day (Midori no Hi)

Japanese national holiday

Cabinet Office of Japan verifies Greenery Day as a national holiday, its 1989 creation on April 29 and the 2005 amendment moving it to May 4 from 2007.

International Respect for Chickens Day

International / United Poultry Concerns advocacy project

United Poultry Concerns identifies International Respect for Chickens Day as an annual May 4 project and traces the campaign to its 2005 launch.

May 4 Day of Remembrance

Kent State University / May 4, 1970 remembrance

Kent State University documents an official May 4 Day of Remembrance established in 1977 and a recurring remembrance tradition that includes a candlelight walk and vigil dating to 1971.

National Day of Reason

United States / secular observance promoted by the American Humanist Association and partner organizations

The current National Day of Reason campaign and American Humanist Association identify May 4 as the annual observance date; a 2026 U.S. House resolution also recognizes May 4, 2026 without…

Remembrance Day

Netherlands / national remembrance observance

Nationaal Comité 4 en 5 mei documents the post-war origin of the National Remembrance tradition, the 1946 national framework, later government decisions, and the current 4 May observance wi…

Rhode Island Independence Day

Rhode Island, United States / state independence commemoration

Rhode Island government sources state that 4 May each year is established as Rhode Island Independence Day, commemorating the General Assembly’s 4 May 1776 Act renouncing allegiance to the…

Star Wars Day / May the 4th

Star Wars / Lucasfilm fan-culture observance

StarWars.com documents May 4 as Star Wars Day and the worldwide “May the 4th” celebration.

African World Heritage Day

UNESCO world day

Indian Arrival Day

Guyana national commemoration

Office of the President of Guyana

International Day of the Midwife

international professional and health-workforce observance

ICM and UNFPA material support annual 5 May recurrence and ICM establishment of the observance in 1992.

Kodomo no Hi (Children’s Day)

Japan / statutory national holiday

Japan’s National Holidays Act establishes Children’s Day on May 5; Cabinet Office historical material documents its original 1948 establishment and date-selection rationale.

Liberation Day (Bevrijdingsdag)

Netherlands / public holiday

Dutch government and National Committee sources verify May 5 Liberation Day, its 1946 establishment, 1968 fixed-date rule and current official public-holiday status; employee day-off entitl…

National Astronaut Day

U.S. spaceflight appreciation observance tied to Alan Shepard’s 1961 Freedom 7 flight

The White House issued a National Astronaut Day message on 5 May 2026 honoring Alan Shepard’s first American human spaceflight; the observance’s organizer describes May 5 as the annual date.

National Cartoonists Day

United States / cartoonist-recognition observance associated with the National Cartoonists Society

Industry retrospective evidence supports a National Cartoonists Society initiative first observed May 5, 1999; the Library of Congress independently verifies the May 5, 1895 Hogan’s Alley c…

National Interpreter Appreciation Day

United States / interpreter appreciation observance

Minnesota Judicial Branch explicitly references National Interpreter Appreciation Day on Wednesday, May 6, 2026; Illinois court and public-school calendars place the observance on Wednesday…

National Silence the Shame Day

Silence the Shame nonprofit mental-health awareness campaign

Silence the Shame identifies 5 May as Silence the Shame Day, focused on reducing stigma and encouraging open discussion around mental wellness.

World Portuguese Language Day

UNESCO / international observance

UNESCO 40 C/Resolution 70 (formal adopted act; 40 C/75 is a separate General Conference document identifier)

National Day of Prayer

United States national prayer observance

36 U.S.C. §119

National Nurses Day

United States / nursing professional recognition

ANA history and federal primary records establish May 6 professional recognition and the date-specific 1982 National Recognition Day for Nurses while separating the later Nurses Week framew…

No Homework Day

United States / creator-defined informal Wellcat observance

The first-party Wellcat Holidays calendar lists No Homework Day on May 6 and identifies the holiday collection as created by Thomas and Ruth Roy.

World Password Day

Cybersecurity-awareness observance

Intel states that it created World Password Day in 2013. The observance is held on the first Thursday of May and is now used broadly for cybersecurity awareness; no single exclusive current…

Jose Abad Santos Day

Province of Pampanga and City of Angeles, Philippines — special nonworking holiday

Republic Act No. 8815 amending Republic Act No. 7552

National Packaging Design Day

United States-origin / packaging-design industry observance created by Design Packaging

A contemporaneous April 2015 announcement published by DIELINE states that Design Packaging established May 7 as National Packaging Design Day and that it would recur annually; DIELINE mark…

International CdLS Awareness Day

International / CdLS Foundation awareness observance

The CdLS Foundation says International CdLS Awareness Day is observed on the second Saturday in May each year and lists the 2026 edition for 9 May.

Letter Carriers’ Stamp Out Hunger® Food Drive

United States and participating U.S. postal jurisdictions / National Association of Letter Carriers annual food drive

NALC states that its annual Letter Carriers’ Stamp Out Hunger® Food Drive launched in 1993 and is held on the second Saturday in May. NALC also states that branch, rural-office and individu…

National Dog Mom’s Day

United States / dog-caregiver appreciation observance

Current pet calendars consistently place National Dog Mom’s Day on the second Saturday in May; the observance is traced to a 2018 launch associated with Dig.

National Report Government Contractor Fraud Day

United States / Hesch Firm fraud-reporting awareness campaign

The Hesch Firm-issued May 2018 founder release states the observance is celebrated May 8 and says Joel D. Hesch formed it in 2018. DOJ material is retained only for current False Claims Act…

National Student Nurses Day

United States / student nursing recognition

The American Nurses Association states that its Board, at the request of the National Student Nurses Association, designated May 8 in 1997 and that the day was celebrated annually as of 199…

No Socks Day

United States / creator-defined informal Wellcat observance

The first-party Wellcat Holidays calendar lists No Socks Day on May 8 and identifies the holiday collection as created by Thomas and Ruth Roy.

Time of Remembrance and Reconciliation for Those Who Lost Their Lives During the Second World War

United Nations / international observance

A/RES/59/26

Truman Day

Missouri / statutory annual commemorative day on 8 May

Missouri Revised Statutes § 9.035, effective 28 August 1967, requires the governor to issue an annual proclamation setting aside 8 May as Truman Day; current gubernatorial proclamations con…

Victory in Europe Day (VE Day)

United Kingdom and wider European remembrance of the end of the Second World War in Europe

UK government material marks 8 May as VE Day and commemorates the end of the Second World War in Europe.

World AS Day

global axial spondyloarthritis awareness observance

Axial Spondyloarthritis International Federation (ASIF)

World Belly Dance Day

International / belly-dance community observance

A Bayfield County, Wisconsin 2026 event page explicitly states that the second Saturday in May is World Belly Dance Day; dance-community historical references attribute the concept to Lydia…

World Fair Trade Day

World Fair Trade Organization / global fair-trade movement

The World Fair Trade Organization currently publishes World Fair Trade Day as a global campaign celebrated every second Saturday in May; the reviewed first-party source does not establish a…

World Fair Trade Day

World Fair Trade Organization campaign and wider Fair Trade movement observance

World Fair Trade Organization (WFTO) currently celebrates World Fair Trade Day every second Saturday of May and publishes the target-year campaign; the reviewed first-party material does no…

World Migratory Bird Day

UNEP-supported global conservation campaign

UNEP / CMS / AEWA partner campaign

World Ovarian Cancer Day

International / World Ovarian Cancer Coalition annual awareness and mobilisation campaign

World Ovarian Cancer Coalition states that World Ovarian Cancer Day was established in 2013 by global ovarian-cancer advocacy leaders, is observed on May 8, and is currently coordinated thr…

World Red Cross and Red Crescent Day

International Red Cross and Red Crescent Movement annual humanitarian recognition observance

IFRC first-party history verifies May 8, post-First-World-War conference origins, the first International Red Cross Day on May 8, 1948, the Henry Dunant birthday rationale, the 1984 change…

Europe Day

European Union observance

European Union and European Commission

Liberation Day

Guernsey / public holiday and liberation remembrance

Official Liberation Day Guernsey material verifies annual May 9 observance, current States of Guernsey Sport and Culture management and the 1945 liberation context.

Mother’s Day — United States statutory observance

United States / federal statutory observance under 36 U.S.C. §117

36 U.S.C. §117 designates the second Sunday in May as Mother’s Day and requests a presidential proclamation. Library of Congress sources trace the national campaign to Anna Jarvis and the 1…

National Infertility Survival Day

United States / unofficial infertility-awareness and self-care observance

A New York Senate resolution identifies Beverly Barna as the creator and states that National Infertility Survival Day is observed each year on the Sunday prior to Mother’s Day.

National Public Gardens Day

United States / American Public Gardens Association awareness initiative

The American Public Gardens Association documents National Public Gardens Day as an annual tradition on the Friday preceding Mother’s Day weekend and records its inauguration in 2009.

Victory Day

Russia / national military and historical commemoration

The 8 May 1945 Soviet decree preserved by the Presidential Library declared 9 May the Victory holiday; current Russian labour-law material lists 9 May as a non-working public holiday.

Día de las Madres in Mexico

Mexico / national social observance

Mexico’s National Population Council documents Día de las Madres on May 10 and traces the Mexican commemoration to 1922.

FSM Constitution Day

Federated States of Micronesia / national Constitution Day

The FSM Government’s Constitution Day messages identify May 10 with the coming into force of the Constitution in 1979 and continue to mark FSM Constitution Day in current government communi…

International Day of Argania

United Nations / international observance

A/RES/75/262

National Independence Day of Romania (Ziua Independenței Naționale a României)

Romania / national commemorative day

A 2026 Romanian prefecture notice states that, following Law 189/2021, the Romanian state has commemorated National Independence Day every year on 10 May since 2022.

National Shrimp Day

Informal food observance with professional-foodservice and seafood-nutrition institutional usage

ANFP chapter calendars and Seafood Nutrition Partnership material independently identify May 10 as National Shrimp Day.

National Washington Day

United States / National Day Calendar National State Days series — Washington

National Day Calendar lists National Washington Day on May 10 as a private Washington State observance; U.S. Senate records statehood on November 11, 1889, and Washington state sources docu…

National Women’s Checkup Day

U.S. women’s preventive-health awareness; historical federal health-campaign usage and current state recognition

A 2026 New York Senate resolution identifies National Women’s Checkup Day as held annually on the second Monday in May and recognizes May 11, 2026 in conjunction with the observance.

Saint Damien de Veuster Day

Hawaii, United States / statutory commemorative day; not a state holiday

Hawaii Revised Statutes §8-8 designates May 10 as Saint Damien de Veuster Day and states that it is not a state holiday; 2010 Act 10 explicitly changed the older Father Damien DeVeuster Day…

Eat What You Want Day

United States / creator-defined informal Wellcat observance

The first-party Wellcat Holidays calendar lists Eat What You Want Day on May 11 and identifies the Wellcat holiday collection as created by Thomas and Ruth Roy.

National Technology Day (India)

India / national science and technology observance

India’s Department of Science and Technology identifies 11 May as National Technology Day, commemorated annually following the 1998 technology achievements.

World Ego Awareness Day

International / Ego Awareness Movement self-reflection and behavior-awareness campaign; non-diagnostic scope

Ego Awareness Movement first-party material identifies May 11, says the movement and observance were established in 2018, and continues to steward the campaign. Reader treatment does not ad…

Fibromyalgia Awareness Day / International Fibromyalgia Awareness Day

Fibromyalgia advocacy community / current Canadian and U.S. state recognition

Fibromyalgia Association Canada states that Fibromyalgia Awareness Day is observed annually on May 12; current 2026 government proclamations in Michigan also recognize May 12 for the year.

International Day of Plant Health

United Nations / FAO international observance

A/RES/76/256

International ME/CFS Awareness Day

International ME/CFS awareness / patient-advocacy context

CDC and NIH recognize May 12 as an international ME/CFS awareness date; May12.org traces the broader May 12 CIND awareness movement to Thomas Hennessy Jr. and RESCIND in 1992. This record i…

National Mental Health Provider Appreciation Day

United States / Anne C. Totero-created May 12 appreciation observance; later state proclamation in Wisconsin

Creator Anne C. Totero states that she created and began advocating for Mental Health Provider Appreciation Day in 2020, with an unofficial first observance on May 12, 2020. Wisconsin later…

National Receptionists Day

United States / workplace appreciation observance

New York Senate Resolution J5006 describes National Receptionists Day as the second Wednesday in May and records its 1991 creation by the Director of the National Receptionists Association.

National Tampon Day

United States / TOP (The Organic Project) creator-defined menstrual-product awareness observance

National Day Archives identifies May 12 and TOP as the 2020 founder; TOP co-founder Denielle Finkelstein later stated first-hand that TOP founded the day in 2020. FDA guidance is used only…

National Third Shift Workers Day

United States / third-shift worker appreciation observance

UFCW national and local materials identify National Third Shift Workers Day on the second Wednesday in May and document union observance activity by at least 2017.

Root Canal Appreciation Day

United States / Dr. Chris Kammer-created informal dental-awareness observance

Contemporaneous March 2005 launch material identifies Madison dentist Dr. Chris Kammer as creator, designates May 11, 2005 as the first National Root Canal Appreciation Day, and states that…

Children of Fallen Patriots Day

United States / state and local commemorative recognition

Michigan's governor proclaimed May 13, 2019 as Children of Fallen Patriots Day, and current state/local government calendars continue to recognize May 13.

IEEE Global Engineering Day

International informal professional engineering appreciation observance used by IEEE organizational units and communities

Multiple IEEE first-party channels document May 13 as IEEE Global Engineering Day and show active IEEE organizational/community use. The recurring date and current IEEE identity are support…

Top Gun Day

International / unofficial Top Gun fan observance

The dedicated Top Gun Day site explicitly identifies May 13 as Top Gun Day and maintains future-year countdown information for the date.

International Chihuahua Appreciation Day

International informal companion-animal appreciation observance / Famous Chihuahua creator-maintained source

Famous Chihuahua identifies Nadia Alterio as founder, continues to mark the observance every May 14, and ties the date to Teaka’s birthday. First-party material proves the observance was in…

National Travel Insurance Claims Day

United States / travel-insurance industry recognition observance

Aon Affinity Travel states that its travel practice started National Travel Insurance Claims Day in 2019; USTIA recognizes the recurring May 14 observance. Coverage and claim outcomes remai…

International Conscientious Objection Day

International / conscientious-objection awareness and historical observance

War Resisters’ International currently uses 15 May for International Conscientious Objection Day. Its historical publications document a long-running May 15 action tradition but contain dif…

International Day of Families

United Nations / international observance

A/RES/47/237

International HG Awareness Day (HGAD)

HER Foundation / hyperemesis gravidarum awareness campaign

The HER Foundation’s 2026 campaign page states that May 15 is International HG Awareness Day.

Kangaroo Care Day® / International Kangaroo Care Awareness Day

Global organizer-led skin-to-skin-care awareness

The official Kangaroo Care Day site identifies May 15 as the annual global awareness initiative, founded in 2011, and publishes dedicated 2026 materials for May 15.

National Learn to Swim Day™

United States / Swimways-founded National Learn to Swim Day™ water-safety awareness program; expanded internationally in 2019

Creator-issued Swimways releases state that Swimways founded National Learn to Swim Day™ in 2012 on the third Saturday of May each year; a 2019 Swimways release documents expansion of the p…

Peace Officers Memorial Day

United States

The White House’s 2026 proclamation states that law authorizes 15 May of each year as Peace Officers Memorial Day.

TSC Global Awareness Day

Worldwide / TSC International and TSC Alliance awareness campaign on 15 May

TSC Alliance history identifies the first worldwide TSC Global Awareness Day as 15 May 2012, and its current international page states that TSC International coordinates the observance each…

VBF International Day of Awareness

International / Vascular Birthmarks Foundation-led awareness campaign

The Vascular Birthmarks Foundation currently identifies May 15 as its International Day of Awareness for vascular birthmarks, anomalies and related syndromes. VBF founder material says Dr.…

World Fiddle Day

international fiddle-music celebration

World Fiddle Day campaign; recurrence and history corroborated in Canada’s National Fiddling Day Act

International AIDS Candlelight Memorial

Global Network of People Living with HIV / global memorial

The International AIDS Candlelight Memorial states that the memorial is held every third Sunday in May and has been observed since 1983 under coordination by GNP+.

International Day of Light

UNESCO international observance

UNESCO 39 C/Resolution 16

International Day of Living Together in Peace

United Nations / international observance

A/RES/72/130

National Do Something Good for Your Neighbor Day

United States / Starr Valentino-created grassroots kindness observance with local civic proclamations

City of Huntsville and City of Milford proclamations credit Starr Valentino with starting the grassroots movement in Atlanta in 2009 and recognize May 16 locally; National Day Calendar says…

National Honor Our LGBT Elders Day

United States / elder-recognition observance supported by SAGE and the National Resource Center on LGBTQ+ Aging

SAGE/National Resource Center materials identify May 16 as National Honor Our LGBT Elders Day; congressional resolutions have also recognized the observance.

National Take Your Parents to the Playground Day

United States / PDPlay-created family/outdoor-play observance

PDPlay says it established the observance in 2009 and that president John Ogden conceptualized it. Older PDPlay material used the Saturday before Easter weekend; current PDPlay material pro…

International Child Helpline Day

Child Helpline International / global network observance

Child Helpline International first-party reports identify 17 May as International Child Helpline Day, state that the first edition was celebrated in 2007, and show continuing network observ…

International Day against Homophobia, Transphobia and Biphobia (IDAHOBIT)

Global decentralized equality and human-rights observance

The IDAHOBIT campaign’s 2026 material identifies May 17 as the International Day against Homophobia, Transphobia and Biphobia and describes global participation around the date.

National Idaho Day

United States / National Day Calendar National State Days series — Idaho

National Day Calendar lists its private National Idaho Day on May 17 within the 2017 National State Days series. The U.S. Senate separately records July 3, 1890 statehood, while Idaho educa…

Supply Chain Professionals Day

International supply-chain profession / CSCMP-created recognition day

CSCMP’s press archive and contemporaneous trade coverage establish the April 9, 2018 launch, inaugural May 21, 2018 observance and third-Monday-in-May recurrence.

World NF Awareness Day

Children’s Tumor Foundation / global NF awareness campaign

CTF verifies May 17 as World NF Awareness Day, distinguishes May 22 NF2-SWN awareness, and archives public use by 2013; the reviewed first-party sources do not establish a single founder or…

World Telecommunication and Information Society Day

ITU / United Nations / international observance

A/RES/60/252

Constitution and State Flag Day

Turkmenistan / national Constitution and State Flag observance

Current Turkmenistan government material verifies annual Constitution and State Flag Day on May 18; official historical material dates adoption of the Constitution to 18 May 1992.

Fête du Drapeau et de l’Université

Haiti / national flag and university observance

The Government of Haiti documented official 18 May 2025 ceremonies for the Fête du Drapeau et de l’Université and described the date’s national symbolic importance.

HIV Vaccine Awareness Day

United States / NIH-led HIV vaccine research awareness

NIH identifies HIV Vaccine Awareness Day (HVAD) as an annual May 18 observance honoring volunteers, communities, health professionals and scientists working on preventive HIV-vaccine resear…

National Cheese Soufflé Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars list National Cheese Soufflé Day on 18 May.

National Stop Nausea Day

United States / Reliefband-created nausea-awareness observance

Reliefband Technologies states that it created National Stop Nausea Day and that it is celebrated on the third Tuesday in May each year.

National Asian & Pacific Islander HIV/AIDS Awareness Day

United States / Asian and Pacific Islander HIV awareness

HIV.gov states that National Asian & Pacific Islander HIV/AIDS Awareness Day is observed annually on May 19 and brings attention to HIV in Asian and Pacific Islander communities.

National Barber Mental Health Awareness Day

United States / barber-industry mental-health awareness observance

The National Association of Barbers identifies May 19 as Barber Mental Health Awareness Day and publishes industry-focused mental-health awareness guidance for the date.

National Hepatitis Testing Day

United States / CDC viral-hepatitis awareness

CDC records that the 2011 HHS viral hepatitis action plan established May 19 as National Hepatitis Testing Day and that the first observance occurred in 2012; current CDC material continues…

National Mechanical Dry Eye Day

United States / Bio-Tissue founder-led dry-eye awareness campaign

Contemporaneous May 2020 optometry coverage reports that Bio-Tissue announced the first National Mechanical Dry Eye Day for May 19 and annual recurrence; later Bio-Tissue-sourced campaign a…

World Fair Play Day

United Nations / international observance

A/RES/78/310

World IBD Day

Organizer-backed international observance

The official World IBD Day campaign states that the observance was created in 2010 during Digestive Disease Week, takes place each May 19, and is coordinated by IFCCA with patient organizat…

Clinical Trials Day

International clinical-research professional community; coordinated by ACRP and sector partners

The Association of Clinical Research Professionals states Clinical Trials Day is observed annually on 20 May and documents its 2026 recognition initiative.

Global Accessibility Awareness Day

Global / digital accessibility and inclusion awareness observance

Official GAAD and GAAD Foundation material states that Joe Devon and Jennison Asuncion launched Global Accessibility Awareness Day in 2012, that it is observed on the third Thursday of May,…

Independence Restoration Day

Timor-Leste / national public holiday and independence commemoration

Timor-Leste government material identifies 20 May as Independence Restoration Day and as a national holiday under the country’s public-holiday framework.

National Day of Cameroon

Cameroon / National Day

Cameroon Presidency material identifies May 20 as National Day and links it to the 1972 referendum establishing the Unitary State; ministry sources list May 20 in the legal-holiday framewor…

National Notebook Day

United States-origin stationery / notebook appreciation observance

The inaugural 2016 announcement identifies May Designs as the creator; subsequent coverage records the recurring rule as the third Thursday in May.

National Rescue Dog Day

United States-origin / creator-led rescue-dog awareness observance

The official National Rescue Dog Day site and Tails That Teach identify Lisa Wiehebrink as founder, state the observance was founded in 2018 and maintain annual May 20 recurrence; National…

National Women in Aerospace Day

United States / congressional recognition context

H. Res. 941 was introduced to recognize May 20 as National Women in Aerospace Day, and the Congressional Record documents a May 20, 2026 House recognition statement.

Restoration of Independence Day

Timor-Leste

Timor-Leste Law No. 10/2005 of 10 August establishes 20 May, Restoration of Independence Day, as a fixed-date national public holiday; current government notices continue that legal status.

World AUTOimmune & AUTOinflammatory Arthritis Day

Global / International Foundation for Autoimmune & Autoinflammatory Arthritis campaign

AiArthritis identifies May 20 as World AUTOimmune & AUTOinflammatory Arthritis Day, says the International Foundation established the awareness day in 2012, and identifies itself as the off…

World Bee Day

FAO / United Nations / international observance

A/RES/72/211

World Metrology Day

UNESCO international day

UNESCO international day

Bike to Work Day

United States / League of American Bicyclists National Bike Month

The League of American Bicyclists lists Bike to Work Day on May 15, 2026 and explicitly gives the future-date rule as the third Friday in May.

Día de las Glorias Navales

Chile naval and national civic commemoration

Chilean Navy

Endangered Species Day

United States conservation awareness observance

GovInfo records the U.S. Senate’s agreed S. Res. 431 designating May 11, 2006 as Endangered Species Day. Current U.S. Fish & Wildlife Service and Endangered Species Coalition material suppo…

International Tea Day

United Nations / FAO international observance

A/RES/74/241

International Virtual Assistants Day

International / virtual-assistant professional recognition associated with OIVAC

The original 2006 announcement and later OIVAC materials describe International Virtual Assistants Day as the third Friday of May each year.

National Defense Transportation Day

United States / federal patriotic and national observance framework

36 U.S.C. §120 requests an annual presidential proclamation designating the third Friday in May as National Defense Transportation Day and recognizing the importance of the U.S. transportat…

National Waiters and Waitresses Day

United States / hospitality-industry appreciation observance

Bar & Restaurant identifies May 21 as National Waiters and Waitresses Day in a dedicated 2014 article and in multiple hospitality promotional calendars.

Sister Maria Hummel Day

Hummel art/collector community / remembrance of Sister Maria Innocentia (Berta) Hummel

The M.I. Hummel organization records Berta Hummel’s birth on 21 May 1909; an observance reference places Sister Maria Hummel Day on the same 21 May birthday anchor.

World Day for Cultural Diversity for Dialogue and Development

United Nations / UNESCO international observance

A/RES/57/249

Commemoration of the abolition of slavery — Martinique

Martinique / statutory abolition commemoration and public holiday

French Law no. 83-550 established the territorial abolition-commemoration public-holiday framework, Decree no. 83-1003 fixed 22 May for Martinique, and current Labour Code article L3422-2 p…

Harvey Milk Day

California, United States / statutory day of special significance

SB 572 (Chapter 626, Statutes of 2009) established the annual May 22 California designation; current CDE material cites Education Code section 37222.13.

International Day for Biological Diversity

United Nations / Convention on Biological Diversity observance

A/RES/55/201

National Craft Distillery Day

United States / N Scott Distillery-created craft-distillery recognition observance

National Day Calendar identifies Nicholas Strauser, Connie Strauser and Brandy Strauser-Sobanski of N Scott Distillery as the 2019 founders and records May 22 as the annual observance date.

National Maritime Day

United States patriotic and national observance

United States Code, title 36 §128

National Vanilla Pudding Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars list National Vanilla Pudding Day on 22 May.

World Goth Day

International goth-subculture community celebration

World Goth Day official material verifies May 22, a 2009 UK Goth Day precursor, 2010 global expansion, co-founders BatBoy Slim and Martin Oldgoth, and current community stewardship.

World Preeclampsia Day

international preeclampsia awareness observance

Preeclampsia Foundation and global maternal-health partners

International Day to End Obstetric Fistula

United Nations / international observance

A/RES/67/147

World Turtle Day®

International / American Tortoise Rescue campaign

The official World Turtle Day site states that American Tortoise Rescue founded the observance in 2000 and that World Turtle Day is held annually on May 23; its 2026 release marks the 26th…

Aviation Maintenance Technician Day

United States aviation profession

The Federal Aviation Administration identifies May 24 as Aviation Maintenance Technician Day and describes it as an opportunity to recognize aviation maintenance technicians.

Battle of Pichincha / Batalla de Pichincha

Ecuador / national civic commemoration and holiday framework

Ecuador’s National Assembly identifies May 24 as the Battle of Pichincha commemoration and links the 1822 battle to the country’s independence; Ecuador’s holiday-law framework uses May 24 a…

Independence Day

Eritrea / May 24 independence commemoration and 1991–1993 statehood chronology

Current Eritrean government material identifies May 24 as the annual Independence Day anniversary and connects it to the 24 May 1991 liberation/de facto-independence milestone, while separa…

International Day of the Markhor

United Nations / international observance

A/RES/78/278

International Women’s Day for Peace and Disarmament

International feminist peace movement / WILPF

Women’s International League for Peace and Freedom states that pacifist feminists established 24 May as International Women’s Day for Peace and Disarmament in the early 1980s.

National Wyoming Day

United States / National Day Calendar National State Days series — Wyoming

National Day Calendar lists the private National Wyoming Day on May 24; U.S. Senate records statehood on July 10, 1890. Wyoming Statutes §8-4-103 separately establishes December 10 as “Wyom…

African Liberation Day (African Day)

The Gambia / official holiday-list terminology

The official Government of The Gambia holiday list names May 25 as African Liberation Day (African Day).

Día de la Revolución de Mayo

Argentina / May Revolution national commemoration

Argentina’s national government identifies May 25 as Día de la Revolución de Mayo y Primer Gobierno Patrio and treats it as an immovable national holiday.

Geek Pride Day

Spain-origin / international geek-culture observance

Spanish press coverage documents May 25 as Día del Orgullo Friki/Geek Pride Day and traces the organized Spanish observance to 2006.

Independence Day

Jordan

Jordan’s Prime Ministry preserves the 25 May 1946 independence declaration, while the Foreign Ministry independently lists May 25 as Independence Day among current public holidays.

International Skin Pigmentation Day

International / Bella Aurora/Lullage brand-led skin-pigmentation awareness campaign

Bella Aurora first-party pages document International Skin Pigmentation Day on 25 May 2021 and call the 2022 campaign the second year running, supporting a 2021 first edition; a later regis…

National Bath Bomb Day

United States / Desert Bath Company-created bath-product observance

National Day Archives records May 25 of each calendar year and identifies Desert Bath Company as the 2021 creator; current calendar coverage preserves the same date.

World Football Day

United Nations / international observance

A/RES/78/281

World Thyroid Day

international thyroid-health awareness observance

European Thyroid Association and sister thyroid associations

Guyana Independence Day

Guyana / national independence anniversary

Parliament of Guyana documents the 26 May 1966 constitutional independence date; current Government of Guyana material confirms continuing May 26 anniversary observance.

Independence Day

Georgia / national holiday

Georgia’s National Archives verifies adoption of the Act of Independence on 26 May 1918, and current Georgian labour law lists 26 May as Independence Day.

IOSF World Otter Day

International / International Otter Survival Fund campaign

IOSF states that it established World Otter Day on the last Wednesday in May; its impact-report timeline records the launch in 2016.

National Blueberry Cheesecake Day

United States / blueberry-industry observance

The U.S. Highbush Blueberry Council repeatedly identifies May 26 as National Blueberry Cheesecake Day in its industry marketing materials.

National Sorry Day

Australia — national remembrance and reconciliation observance

Australian Human Rights Commission, AIATSIS, Reconciliation Australia and current PM&C material verify May 26, the first National Sorry Day on 26 May 1998 and the date’s connection to the 1…

Commemoration of the abolition of slavery — Guadeloupe

Guadeloupe / statutory abolition commemoration and public holiday

French Law no. 83-550 established the territorial abolition-commemoration public-holiday framework, Decree no. 83-1003 fixed 27 May for Guadeloupe, and current Labour Code article L3422-2 p…

Commemoration of the abolition of slavery — Saint-Martin

Saint-Martin / statutory abolition commemoration and public holiday

French Decree no. 2012-553 specifically added Saint-Martin to the territorial abolition-commemoration schedule with 27 May annually; current Labour Code article L3422-2 lists the Saint-Mart…

Emergency Medicine Day

Organizer-backed international observance

European Society for Emergency Medicine (EUSEM) and participating emergency-medicine organizations

National Hairstylist Mental Health Awareness Day

United States / Booksy-created hairstylist mental-health awareness observance

Beauty-industry material published on May 27 states that Booksy designated May 27 as National Hairstylist Mental Health Awareness Day; current observance listings attribute the 2021 creatio…

Bermuda Day

Bermuda / public holiday and cultural celebration on the fourth Friday in May.

Government of Bermuda currently lists Bermuda Day as a public holiday under the Public Holidays Act 1947 framework, uses the fourth Friday in May, and states that the first Bermuda Day Para…

European Neighbours’ Day

Europe / neighbourhood-solidarity initiative originating in Paris in 1999

European institutional and city-project sources describe European Neighbours’ Day as an annual event held on the last Friday of May, originating in Paris in 1999.

Independence Day

Azerbaijan / national holiday

Azerbaijan’s 2021 law names 28 May Independence Day, commemorating the 1918 declaration by the Azerbaijan Democratic Republic; the presidential holiday register uses the current Independenc…

International Day of Action for Women’s Health

international women’s health and health-rights campaign

May 28 campaign history states that LACWHN proposed annual May 28 commemoration in 1987 in Costa Rica and WGNRR was asked to lead the campaign globally.

National Day

Ethiopia

Official Ethiopian sources identify May 28 as a national day/national holiday associated with the 1991 downfall of the Derg military government. The Ethiopian Investment Commission currentl…

National Flag Day / National Flag Days

Philippines / national flag commemoration and statutory Flag Days period

Philippine law declares May 28 through June 12 each year as Flag Days; Proclamation No. 374 (1965) established May 28 as Flag Day to commemorate the first unfurling of the Philippine flag a…

National Hamburger Day

United States / informal food observance with repeated burger-brand usage

Wendy’s and BurgerFi first-party materials identify May 28 as National Hamburger Day in separate years.

National Heat Awareness Day

United States / heat-safety awareness

Consecutive New York legislative resolutions describe National Heat Awareness Day as observed each year on the last Friday in May. NWS and OSHA provide authoritative heat-safety guidance, b…

Whooping Crane Day

North America / May 28 whooping-crane conservation awareness observance

Houston Zoo states that Whooping Crane Day takes place on May 28 each year, and the International Crane Foundation promoted the same May 28 observance in 2026; reviewed primary conservation…

World Hunger Day

Global hunger-awareness and community-action campaign; humanitarian/non-partisan scope

Current World Hunger Day first-party material verifies May 28, says The Hunger Project founded the observance in 2011, and identifies ongoing campaign leadership. Current statistics remain…

World Passion Fruit Martini Day

International promotional/cocktail context / Funkin Cocktails-created observance

Current references place World Passion Fruit Martini Day on May 28 and attribute its establishment in 2021 to Funkin Cocktails.

International Day of UN Peacekeepers

United Nations / international observance

A/RES/57/129

International Sagarmatha (Mount Everest) Day

Nepal mountaineering and tourism commemoration of the first confirmed ascent of Everest

Government of Nepal / Nepal Tourism Board evidence supports annual May 29 International Sagarmatha Day, a first 2008 programme and continuing Ministry/NTB/NMA involvement, commemorating Ten…

National Alligator Day

Wild Florida-created wildlife education observance / United States origin

Wild Florida says it decided to create National Alligator Day in February 2021 and launched the observance on May 29, 2021 to encourage appreciation and education about alligators; Florida…

International Day of Potato

FAO / United Nations / international observance

A/RES/78/123

National E-Bike Day

United States / Lectric eBikes-founded recognition day

Lectric eBikes and the Outdoor Industry Association identify May 30 as National E-Bike Day and attribute its establishment to Lectric.

Amateur Radio Military Appreciation Day

United States / ARMAD founder-led amateur-radio military appreciation event

ARMAD was founded by Emery McClendon in 2003. Contemporary ARMAD references place the annual event on the Saturday of U.S. Memorial Day weekend.

Memorial Day

United States

U.S. federal sources document the Grand Army of the Republic’s General Orders No. 11 of May 5, 1868, the May 30 Decoration Day observance, and current federal law placing Memorial Day on th…

National Fisherfolks Day

Philippines / national fisherfolk-sector recognition

Philippine Proclamation No. 261 (2000) declares May 31 of every year as National Fisherfolks Day.

National Italian Beef Day

United States / informal Buona-created Italian-beef promotion

Buona Companies states that it founded/established National Italian Beef Day in 2015 after petitioning to designate the Saturday during U.S. Memorial Day weekend; its 2025 and 2026 first-pa…

National Save Your Hearing Day

United States / hearing-loss prevention awareness observance

CDC/NIOSH explicitly identifies May 31 as National Save Your Hearing Day; longstanding professional materials also use the May 31 observance.

National Smile Day

Privately founded smile/dental-awareness observance

A founder-issued press release from Compassionate Dental Care states that Dr. Tim Stirneman and Jim Wojdyla founded National Smile Day on 31 May.

National Utah Day

United States / National Day Calendar National State Days series — Utah

National Day Calendar lists the private May 31 National Utah Day. The U.S. Senate records January 4, 1896 statehood. Utah Division of Indian Affairs sources document eight federally recogni…

Necrotizing Fasciitis Awareness Day

United States / awareness day repeatedly recognized by state proclamations

State government proclamations in multiple years designate May 31 as Necrotizing Fasciitis Awareness Day, supporting a recurring commemorative date while not making it a federal holiday.

Prayer for Peace, Memorial Day

United States / federal Memorial Day prayer proclamation framework

36 U.S.C. §116 directly establishes the recurring last-Monday-in-May federal prayer-proclamation framework; current presidential proclamations continue the statutory practice.

World No Tobacco Day

WHO / international observance

WHA42.19

World Parrot Day

Global / World Parrot Trust conservation and welfare observance

World Parrot Trust states that World Parrot Day began in 2004, is observed each May 31, and continues as a WPT-led global conservation and welfare campaign.