September 2026 observances

Building and Code Staff Appreciation Day

United States / professional appreciation observance with local-government proclamation evidence

The City of Lodi states in its 2026 proclamation background that Building and Code Staff Appreciation Day is observed annually on September 1; EventGuide independently lists September 1 eac…

Constitution Day

Slovak Republic

Slovak law lists 1 September as Constitution Day of the Slovak Republic; parliamentary history ties the date to adoption of the Constitution on 1 September 1992, while current government gu…

Ginger Cat Appreciation Day

Informal pet-appreciation observance with independently reported 2014 founder and repeated veterinary-institution date use

UPI identifies Chris Roy as the 2014 founder and September 1 as the annual date; Animal Medical Center calendars independently repeat the date across multiple years.

Independence Day of the Republic of Uzbekistan

Uzbekistan

A 2026 government page identifies 1 September as Independence Day of the Republic of Uzbekistan and describes it as the main national holiday.

National Child Identity Theft Awareness Day

United States / Experian-created child identity-theft awareness campaign

Experian announced on August 27, 2018 that it was designating September 1 as Child Identity Theft Awareness Day and intended it to become an annual reminder; the campaign included September…

National Little Black Dress Day

United States / Black Heart Association cardiovascular-awareness initiative focused especially on Black women

The Black Heart Association currently describes National Little Black Dress Day as its signature awareness initiative, says it is observed annually on September 1, and states that the assoc…

National Wattle Day

Australia national floral-emblem commemoration

The Australian Government states that 1 September is National Wattle Day and records that the observance was officially proclaimed on 23 June 1992; current 2026 government material continue…

World Letter Writing Day

Global / World Letter Writing Day founder-led initiative

World Letter Writing Day’s official site documents its launch on 1 September 2014 and continues to identify 1 September as the celebration date.

Commemoration of the Surrender of General Tomoyuki Yamashita

Special nonworking holiday in the Province of Ifugao, Philippines

Republic Act No. 11120

Global Talent Acquisition Day

Talent acquisition profession / ATAP creator-origin observance

ATAP and KRT Marketing launched Global Talent Acquisition Day on 5 September 2018 and stated that it would recur on the first Wednesday of September; ATAP currently continues Global TA Day…

Indigenous Literacy Day

Australia / First Nations stories, cultures and languages

The Indigenous Literacy Foundation states that it created Indigenous Literacy Day in 2007, has hosted it annually since then and holds the national celebration on the first Wednesday in Sep…

National Day of Viet Nam

Viet Nam / national day

The official Government of Viet Nam information channel identifies 2 September as National Day and documented the 81st National Day anniversary in 2026.

National Live Fearless Day

United States / Landry Champlin-created personal-development observance

Landry Champlin’s current first-party biography says she started National Live Fearless Day; National Day Archives identifies Champlin as the creator in 2020 and September 2 as the annual d…

World Coconut Day

International / International Coconut Community member-country observance

International Coconut Community material states that 2 September is World Coconut Day and commemorates the 1969 establishment of the ICC, formerly APCC; public-institution material document…

Foundation Day / National Day of San Marino

San Marino

Government diplomatic sources identify 3 September as San Marino’s national/foundation day

Merchant Navy Day

United Kingdom

GOV.UK marks Merchant Navy Day on 3 September and describes the contribution of merchant seafarers

Feast of Saint Rosalia

Catholic liturgical remembrance of Saint Rosalia, especially associated with Palermo, Sicily

Vatican News lists Saint Rosalia, Virgin of Palermo, on 4 September. The City of Palermo documents a September 4 liturgical memory in a fourteenth-century breviary fragment, supporting the…

National Wildlife Day

United States / creator-led wildlife awareness observance

Creator Colleen Paige’s current site identifies her as founder and lists National Wildlife Day on September 4. Sacramento Zoo corroborates a 2005 founding and separately notes February 22 u…

Taekwondo Day

Organizer-backed worldwide sport observance

World Taekwondo and the Taekwondo Promotion Foundation identify September 4 as Taekwondo Day, designated by the World Taekwondo General Assembly on July 25, 2006 to commemorate the IOC’s Se…

International Day of Charity

United Nations international observance

A/RES/67/105

International Day of the World's Indigenous Women and Girls

United Nations / international observance

A/RES/80/10

Mother Teresa Day (Dita e Nënë Terezës)

Albania / official public holiday and commemoration

Current Albanian official calendars recognize September 5 as Saint Teresa Sanctification Day. Albanian government legislative/ceremonial material documents replacement of the former October…

National Be Late for Something Day

United States / informal lifestyle observance created by the Procrastinators’ Club of America; participation guidance limited to low-stakes situations

National Day Calendar identifies the Procrastinators’ Club of America, founded by Les Waas in 1956, as the body whose committee designated September 5 as Be Late for Something Day; Timeandd…

Dia di Boneiru, Dia di Himno i Bandera

Bonaire / special public observance and island national day

The Dutch central government lists 6 September for Bonaire as Dia di Boneiru, Dia di Himno i Bandera; Bonaire’s public body called 6 September 2026 its national day and published the offici…

Eswatini Independence Day

Kingdom of Eswatini / national holiday

Eswatini’s current Public Holidays Act schedule lists Somhlolo (Independence Day) on 6 September; official national/diplomatic material anchors independence to 6 September 1968.

National Grandparents Day

United States / statutory patriotic and national observance

36 U.S.C. §125 requests an annual presidential proclamation for the first Sunday in September after Labor Day; 1978 proclamation and 1979 law history are preserved separately.

Independence Day

Brazil

Brazilian federal Law No. 662 of 6 April 1949, as amended, lists 7 September as a national holiday. Federal historical material identifies 7 September 1822 as the conventional national inde…

International Day of Clean Air for Blue Skies

UNEP / United Nations / international observance

A/RES/74/212

International Day of Police Cooperation

United Nations / international observance

A/RES/77/241

Labor Day

United States federal holiday

U.S. Department of Labor history and 5 U.S.C. 6103 verify the 1882 first celebration, the 1894 federal enactment and the current first-Monday-in-September legal holiday; founder attribution…

Labour Day

Canada — Labour Day public holiday; jurisdiction-specific employment-law entitlements

Canada government holiday schedules and federal labour standards; this Canadian date must not be generalized internationally.

National Grateful Patient Day

United States / grateful-patient recognition initiative founded by Rolf Benirschke

Rolf Benirschke’s first-party biography identifies September 7, 2017 as the inaugural National Grateful Patient Day and launch of the Grateful Patient Project; National Day Calendar records…

National New Hampshire Day

United States / National Day Calendar National State Days series — New Hampshire

National Day Calendar lists National New Hampshire Day on 7 September. The U.S. Senate records New Hampshire’s admission/statehood date as 21 June 1788. The two dates are deliberately kept…

World Duchenne Awareness Day

United Nations / international observance

A/RES/78/12

Dia de Meritxell / Mare de Déu de Meritxell

Andorra / national holiday and patronal observance

The Government of Andorra identifies 8 September as the feast of the Virgin of Meritxell and a national holiday in the Andorran labor calendar.

International Literacy Day

UNESCO international observance

UNESCO 14 C/Resolution 1.441

National Dog Walker Appreciation Day

United States / Wag!-created dog-walker recognition day

Wag! announced the first annual National Dog Walker Appreciation Day for September 8, 2016 and established September 8 as the recognition date.

Pediatric Hematology/Oncology Nurses’ Day

Pediatric hematology/oncology nursing profession / APHON

The Association of Pediatric Hematology/Oncology Nurses states that Pediatric Hematology/Oncology Nurses’ Day was established by APHON in 2010 and is celebrated every year on September 8.

World PT Day

Organizer-backed international observance

World Physiotherapy

California Admission Day

California, United States / state legal holiday and civic commemoration; not automatically a paid day off or statewide office closure

California Government Code § 6700 lists September 9 as Admission Day; state education and parks sources connect the date to California’s September 9, 1850 admission as the 31st U.S. state.

Emergency Services Day (999 Day)

United Kingdom / Emergency Services Day campaign

The official 999 Day site states that Emergency Services Day is held on 9 September each year and describes it as a national day across the UK.

International Day to Protect Education from Attack

United Nations international observance

A/RES/74/275

International FASD Awareness Day

Global / FASD United awareness campaign

FASD United’s 2026 awareness-month material states that September 9 is International FASD Awareness Day each year and frames it around awareness, understanding, support and systems change.

International Sudoku Day

International puzzle-community observance

Logic Masters India records the World Puzzle Federation’s announcement of 9/9 as International Sudoku Day; an institute under Turkmenistan’s Ministry of Foreign Affairs independently record…

State Independence Day of the Republic of Tajikistan

Tajikistan / national independence observance

Tajikistan’s official legal database verifies Supreme Council Resolution No. 392 of September 9, 1991 proclaiming state independence and designating September 9 a national holiday; the acti…

Wonderful Weirdos Day

United States / creator-defined informal Wellcat observance

The first-party Wellcat Holidays calendar lists Wonderful Weirdos Day on September 9 and identifies the collection as created by Thomas and Ruth Roy.

National School Picture Day

United States / Lifetouch-created school-photography observance

Lifetouch states that it declared National School Picture Day in 2019 and set it for the second Thursday in September each year.

R U OK?Day

Australia suicide-prevention conversation and connection campaign

R U OK? states that the campaign was born in 2009 from Gavin Larkin’s work with Janina Nearn and that R U OK?Day is held on the second Thursday in September; the organization gives 9 Septem…

National Make Your Bed Day

United States / informal lifestyle observance

National Day Calendar consistently places National Make Your Bed Day on September 11 and explicitly notes that its origin is unidentified.

Patriot Day

United States national day of remembrance

U.S. Government Publishing Office

Farmers Consumer Awareness Day

Quincy, Washington / long-running farmer-consumer education event

Farmers Consumer Awareness Day in Quincy is held on the second Saturday in September; the community event traces its program to 1981.

International Drive Your Studebaker Day

International / Studebaker Drivers Club official event

The Studebaker Drivers Club identifies International Drive Your Studebaker Day as an official SDC event held on the second Saturday in September and lists 12 September for 2026.

National Report Medicare Fraud Day

United States / Hesch Firm-created anti-fraud awareness observance recognized in FBI public outreach

FBI Phoenix explicitly recognized National Report Medicare Fraud Day on September 12, while observance records attribute the campaign to former DOJ attorney Joel Hesch and the Hesch Firm.

Tag der deutschen Sprache (German Language Day)

German-language community / organizer-led observance

Verein Deutsche Sprache (VDS) states that it launched Tag der deutschen Sprache in 2001 and that the action day is held on the second Saturday in September.

United Nations Day for South-South Cooperation

United Nations / international observance

A/RES/58/220

World First Aid Day

Organizer-backed global first-aid awareness observance

International Federation of Red Cross and Red Crescent Societies (IFRC)

International Chocolate Day

International / informal confectionery-industry chocolate observance

National Institute of Advanced Studies identifies September 13 International Chocolate Day as an initiative of the U.S. National Confectioners Association. NCA itself continues to acknowled…

International Day of Caves and Karst

UNESCO international day

National Hug Your Hound Day

United States / pet appreciation observance

National Day Calendar identifies National Hug Your Hound Day as the second Sunday in September and attributes its creation to Ami Moore. Independent calendar corroboration produces dates co…

National Pet Memorial Day

International Association of Pet Cemeteries and Crematories pet-remembrance observance

The International Association of Pet Cemeteries and Crematories says National Pet Memorial Day is held each year on the second Sunday in September and was established by the IAOPCC in 1971…

Pet Birth Defect Awareness Day

Pet/veterinary awareness-calendar usage

September 13 is repeated by veterinary-awareness calendars; Valley Animal Center reports a 2014 establishment associated with Rogers and the MB Jungle Foundation, while unsupported launch/s…

Roald Dahl Story Day

Literacy/storytelling celebration and charity fundraising context

Roald Dahl’s Marvellous Children’s Charity currently promotes Roald Dahl Story Day as an annual global celebration beginning from 13 September, with schools able to choose a suitable partic…

Uncle Sam Day in the State of New York

New York State, United States / statutory commemorative day

New York Executive Law §168-a designates September 13 in each year as “Uncle Sam Day in the State of New York” and expressly provides that a day of commemoration is not a holiday or half-ho…

National Rosa Tequila Day

International / informal private tequila-industry observance associated with CALIROSA; alcohol participation is optional and any alcoholic participation is limited to adults of legal drinking age.

CALIROSA’s own company post describes its September 14, 2022 gathering as the first-ever National Rosa Tequila Day celebration, while independent PR/event coverage describes the CALIROSA ga…

National Virginia Day

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

National Day Calendar documents National Virginia Day on September 14 within its private National State Days series; U.S. Senate records Virginia’s statehood/ratification date as June 25, 1…

World Atopic Eczema Day

Organizer-backed global health awareness observance

GlobalSkin and the international atopic-eczema community

Get Ready Day

American Public Health Association / emergency preparedness

APHA holds Get Ready Day on the third Tuesday in September as part of its Get Ready preparedness campaign; APHA’s campaign archive describes a September 2007 event as the first-ever Get Rea…

Grito de Independencia / Grito de Dolores

Mexico; national independence commemoration tradition

Mexico’s Presidency verifies the September 15 national ceremony; Defense Ministry history places the historical Grito in the early hours of September 16, 1810, distinct from the September 1…

Independence Day

Costa Rica / mandatory paid national holiday

Costa Rica’s Labour Code and 2026 Ministry of Labour notice verify September 15 as a mandatory paid holiday, while Culture Ministry history links the annual date to the 15 September 1821 Ce…

Independence Day

El Salvador / paid national independence holiday

El Salvador’s Labour Code lists September 15 as a paid day of rest, public-service law names it Independence Day, and Culture Ministry material ties the anniversary to the 15 September 1821…

Independence Day

Guatemala

Current Guatemalan government commemoration verifies the September 15 national anniversary and the 1821 independence-act identity; Decree 1618/current labour law independently verify later…

Independence Day

Honduras

Honduran judiciary history verifies the September 15, 1821 independence anchor in the Central American context; the Labour Code (Decree 189-59) separately includes September 15 among paid h…

International Day of Democracy

United Nations / international observance

A/RES/62/7

IT Professionals Day / IT Pro Day

SolarWinds-created technology-professional appreciation observance

SolarWinds states that IT Pro Day began in 2015 and is observed on the third Tuesday of every September.

National Africa Civility Day

Africa-focused / World Civility Presidential Club-created humanitarian recognition observance

National Day Archives records September 15 and credits World Civility Presidential Club with founding the observance in 2020; current awareness calendars retain September 15.

National Cheese Toast Day

United States / Sizzler-created branded food observance

Sizzler’s own press releases celebrate National Cheese Toast Day on September 15 and identify the chain’s participation in the observance.

National Online Learning Day

United States / online-learning community observance registered in 2016

National Day Calendar states the observance was established in 2016 and proclaimed for September 15 annually; universities continue to recognize the same date.

National Tackle Kids Cancer Day

United States / Tackle Kids Cancer and Hackensack University Medical Center Foundation recognition

National Day Calendar identifies Hackensack University Medical Center Foundation as founder, places the observance on September 15 and records annual observance beginning in 2017. Current T…

World Afro Day

global Afro-hair celebration, education and anti-discrimination observance

World Afro Day organization; first event endorsed by the UN Office of the High Commissioner for Human Rights

Independence Day

Papua New Guinea

Papua New Guinea’s Constitution identifies 16 September 1975 as Independence Day; government education material documents the House of Assembly date choice and first celebration, while curr…

International Day for Interventional Cardiology

United Nations / international observance

A/RES/76/302

International Day for the Preservation of the Ozone Layer

United Nations / international observance

A/RES/49/114

International Day of Science, Technology and Innovation for the South

United Nations / international observance

A/RES/78/259

Malaysia Day

16 September | Malaysian national holiday; 1963 federation distinct from 1957 Merdeka

Government of Malaysia official portal

Mexico Independence Day

Mexico

The Organization of American States’ current country page lists Mexico National Independence Day as 16 September.

National PLAY-DOH Day

United States / Hasbro-created PLAY-DOH brand observance; later expanded globally as World PLAY-DOH Day

Hasbro states that National PLAY-DOH Day is celebrated annually on September 16 and was created by Hasbro in 2006. Hasbro states that the U.S. observance had been recognized since 2006 when…

National Stepfamily Day

United States / family-awareness observance founded by Christy Tusing-Borgeld

The U.S. Census Bureau identifies September 16 as Stepfamily Day and traces the observance to Christy Tusing-Borgeld in 1997.

World Barber Day

international barber-community and giving-back observance

World Barber Day organizers; launched in Ireland in 2017

AKC Responsible Dog Ownership Day

American Kennel Club / responsible dog ownership campaign

The American Kennel Club designated September 17, the anniversary of the AKC’s founding, as AKC Responsible Dog Ownership Day and continues to publish the observance through its Responsible…

Australian Citizenship Day

Australian national citizenship observance

The Australian Department of Home Affairs states that Australian Citizenship Day is celebrated every year on September 17, was established by the Australian Government and first celebrated…

Constitution Day and Citizenship Day

United States

36 U.S.C. §106 designates September 17 as Constitution Day and Citizenship Day and states that it commemorates the Constitution’s signing on September 17, 1787 and recognizes citizens. Publ…

International Country Music Day

International / informal country-music appreciation observance created by the Country Music Association of Spain

The original International Country Music Day organizer record states that the Country Music Association of Spain created the observance in 2003 and holds it every September 17 to commemorat…

National DEI Day

United States / National DEI Day organizer-led observance

The National DEI Day organizer site states that the observance is held each year on September 17, deliberately coinciding with U.S. Constitution Day and Citizenship Day.

National Pawpaw Day

Kentucky State University agriculture and native-fruit awareness observance

Kentucky State University documents the inaugural National Pawpaw Day on 19 September 2019 and establishes the third Thursday of each September for pawpaw awareness.

National Pet Bird Day

United States-origin / Bird Enjoyment & Advantage Koalition companion-bird campaign

BEAK/myBird states that BEAK created National Pet Bird Day in 2019 and that it takes place September 17 each year; avian-veterinary material supports responsible-ownership boundaries.

National Pet Carbon Monoxide (CO) Safety Day

United States and Canada / Kidde-origin pet carbon-monoxide safety campaign

Kidde’s September 17, 2020 launch announcement identifies that date as the first National Pet Carbon Monoxide (CO) Safety Day and frames it as a people-and-pets CO prevention and alarm-awar…

National Professional House Cleaners Day

United States / American House Cleaners Association-founded professional recognition

National Day Calendar records the American House Cleaners Association as founder and September 17 as the annual observance date.

World Patient Safety Day

World Health Organization global health observance

WHO observance

Chile Independence Day

Chile

Chile’s Biblioteca del Congreso Nacional verifies Law No. 2,977 listing September 18 as a holiday commemorating national independence and explains that the date reflects the First Governmen…

International Equal Pay Day

United Nations international observance

A/RES/74/142

International Grenache Day

International Grenache/wine-community observance

Grenache Association first-party history says International Grenache Day was launched in 2010 after the first International Grenache Symposium and is now held annually on the third Friday o…

National Concussion Awareness Day®

United States / organizer-led National Concussion Awareness Day® campaign; medical-awareness observance, not a federal holiday

The official National Concussion Awareness Day® site states that Brooke Mills founded the observance in 2016 and that it is recognized on the third Friday of September each year. A 2018 org…

National HIV/AIDS and Aging Awareness Day

United States / HIV and aging awareness

HIV.gov and NIH identify September 18 as National HIV/AIDS and Aging Awareness Day. NIH states that The AIDS Institute launched the observance on September 18, 2008; current federal materia…

National POW/MIA Recognition Day

United States / federal POW/MIA remembrance observance

Public Law 95-349 designated July 18, 1979 as National P.O.W.-M.I.A. Recognition Day and President Jimmy Carter issued Proclamation 4664 for that inaugural observance. Current Defense POW/M…

National Respect Day

United States / respect-in-relationships and violence-prevention awareness campaign associated with Futures Without Violence and Macy’s

Contemporaneous 2008 reporting identifies the first annual National RESPECT! Day on September 19, 2008 through the Family Violence Prevention Fund–Macy’s campaign; current histories record…

Read an Ebook Day

OverDrive / organizer-led reading campaign

OverDrive states that Read an Ebook Day takes place every September 18 and documents the campaign’s 2014 launch.

World Bamboo Day

World Bamboo Organization global bamboo-awareness observance / September 18; created 2009; sustainability claims remain evidence-bounded

World Bamboo Organization first-party pages verify September 18, state that WBO created World Bamboo Day in 2009, place the first celebration at the 8th World Bamboo Congress in Bangkok, an…

World Water Monitoring Day

International water-quality awareness and community-monitoring observance / EarthEcho Water Challenge

U.S. EPA material documents the inaugural World Water Monitoring Day in 2003 as coordinated by America’s Clean Water Foundation and the International Water Association, originally centered…

Aortic Dissection Awareness Day

Global / aortic-disease awareness campaign

The Aortic Dissection Charitable Trust states that Aortic Dissection Awareness Day occurs every September 19 and identifies Timo Söderlund as the founder of the awareness-day initiative.

Día de las Glorias del Ejército

Chile Army civic-military commemoration and legal holiday

Chilean Army; legal-holiday tradition traced to a 1915 decree

International Coastal Cleanup®

Ocean Conservancy / global cleanup campaign

Ocean Conservancy states that the International Coastal Cleanup is held annually on the third Saturday of September, with many cleanups also occurring throughout the month.

International Red Panda Day

International red-panda conservation education observance led by Red Panda Network; wildlife-welfare-safe and conservation-source-bounded

Red Panda Network first-party material states that it launched International Red Panda Day in 2010 and that the observance takes place every year on the third Saturday of September. Current…

International Talk Like a Pirate Day

Founder-created international novelty observance

TIME documents International Talk Like a Pirate Day as an annual 19 September observance created by John Baur and Mark Summers in 1995.

National Cartonnage Day

United States / cartonnage craft community

National Day Archives records Colorway Arts as the creator and states the observance occurs on the third Saturday of September; Colorway Arts documents the original September 18, 2021 event.

National Cat DNA Day

United States / Basepaws-origin feline-genetics awareness day

National Day Archives records September 19 and identifies Basepaws as the 2020 founder; Basepaws continues to reference National Cat DNA Day in its own materials.

National CleanUp Day

United States / organizer-led volunteer cleanup campaign

The official National CleanUp Day organization states that the observance takes place every year on the third Saturday in September.

National Dance Day

United States / American Dance Movement annual dance-participation observance

American Dance Movement states that National Dance Day was established in 2010 and, since 2019, takes place annually on the third Saturday in September.

National Multivitamin Day

United States / GNC-created consumer awareness observance

GNC launched the first National Multivitamin Day in 2024 and states that the observance is held on the third Saturday of September; current 2026 calendar treatment resolves that rule to Sep…

Puppy Mill Awareness Day

United States-origin / animal-welfare awareness campaign

Last Chance for Animals states that it and other animal activists started Puppy Mill Awareness Day in Lancaster, Pennsylvania in 2004 and that it takes place annually on the third Saturday…

Usher Syndrome Awareness Day

Usher Syndrome Coalition / global awareness campaign

The Usher Syndrome Coalition states that it declared the third Saturday in September Global Usher Syndrome Awareness Day in 2015. Coalition material records September 19, 2015 as the first…

International Day of University Sport

UNESCO international day

National Care for Kids Day®

United States / Care for Kids and Designetics Cares-created child-support observance

Designetics says it spearheaded the effort that created National Care for Kids Day for annual September 20 observance; current Care for Kids first-party material says the day was founded in…

National Crime and Intelligence Analyst Appreciation Day

United States / crime and intelligence analyst professional recognition created by FCIAA

The Florida Crime & Intelligence Analyst Association states that it created NCIAAD in 2021 and promotes the sixth annual observance on September 20, 2026; IALEIA also recognizes the day.

National Fried Rice Day

United States / Benihana-created food observance

Benihana declared September 20 the first annual National Fried Rice Day in 2018 and has continued to associate the observance with that date.

National String Cheese Day

United States / Galbani Cheese-founded informal food observance registered through National Day Calendar

National Day Calendar’s proclamation record identifies Galbani Cheese as the 2017 founder and establishes September 20 as the annual observance date.

NFT Day / International NFT Day

Web3 industry / 2022 Dapper Labs and partner-consortium campaign

Dapper Labs, Flow and an industry consortium launched the first official NFT Day for September 20, 2022. The date commemorates an original non-fungible-token standard draft dated September…

Weltkindertag (World Children’s Day in Germany)

Germany / World Children’s Day; statutory public holiday in Thuringia, not nationwide

UNICEF Germany states that Weltkindertag is observed every September 20; it has been a statutory public holiday in Thuringia since 2019.

World Cleanup Day

United Nations / international observance

A/RES/78/122

Armenia Independence Day

Armenia / statutory Independence Day

Armenia’s legal-information system records the 21 September 1991 independence referendum, the 24 September 1991 decision making September 21 a festive non-working day, and the current Holid…

Belize Independence Day

Belize

Belize government sources identify September 21, 1981 as the date of independence. The current public-holiday framework is separate: the Holidays Act makes scheduled days public holidays, a…

Independence Day

Malta

Malta government history states that Prime Minister George Borg Olivier set September 21 as Independence Day; UK legislation fixes 21 September 1964 as the independence transition and curre…

International Day of Peace

United Nations / international observance

A/RES/36/67

National Cat & Dog Gut Health Awareness Day

Pet-health awareness / September 21 observance with AnimalBiome 2022 activation and veterinary-calendar recurrence

AnimalBiome documented celebrating Cat & Dog Gut Health Awareness Day on September 21, 2022 while launching its inaugural State of the Gut report. The Animal Medical Center independently li…

National Opioid Awareness Day

United States / September 21 public-health opioid-awareness observance recognized by IHS and state health authorities; distinct from a separately documented September 16 same-name campaign

Indian Health Service identifies September 21 as National Opioid Awareness Day; Alabama Department of Mental Health calls September 21 an annual observance in 2025 and 2026. A separately do…

Respect for the Aged Day (敬老の日)

Japan / national holiday rule

Japan’s Cabinet Office explains that Respect for the Aged Day has fallen on the third Monday of September since 2003; in 2026 that is 21 September. It separately identifies 15 September as…

Elephant Appreciation Day

Informal elephant-appreciation observance documented by zoo and Smithsonian institutional sources

Creator-linked archival references and current wildlife/institutional sources support Wayne Hepburn / Mission Media-WildHeart Productions, a 1996 start and annual September 22 use; exclusiv…

National Girls' Night In Day

United States / Ketel One Botanical brand-created observance

National Day Calendar’s proclamation archive states that Ketel One Botanical founded the observance in 2018 and set it annually for September 22.

Proclamation of Independence

Mali

Mali government material marks September 22 as the anniversary of accession to independence; a contemporaneous UN record states that Act No. 60-35/AL/RS of September 22, 1960 proclaimed the…

World Rhino Day

international rhino awareness and conservation observance

World Rhino Day’s official history records WWF-South Africa’s 2010 announcement and a 2011 international expansion led by Lisa Jane Campbell and Rhishja; September 22 remains the annual dat…

Celebrate Bisexuality Day

International bisexual+ community visibility and awareness observance

Boston City Council’s 2025 resolution records the observance as first celebrated on 23 September 1999 and founded by Wendy Curry, Michael Page and Gigi Raven Wilbur; GLAAD’s current communi…

International Day of Sign Languages

United Nations / international observance

A/RES/72/161

National Apple Cider Vinegar Day

United States / Bragg-created brand observance

Bragg states that National Apple Cider Vinegar Day is celebrated on September 23 and identifies the observance as a Bragg-created campaign.

National Field Marketer’s Day

United States / Splash-created field-marketing recognition observance

Splash created the inaugural National Field Marketer’s Day for September 23, 2021 and stated annual intent; official Cvent community material for Splash continued the September 23 celebrati…

National Great American Pot Pie Day

United States / Marie Callender’s-created food observance

National Day Calendar records September 23 as National Great American Pot Pie Day and attributes creation of the observance to Marie Callender’s in 2002.

National Snack Stick Day

United States / Klement’s-created snack-stick celebration

Klement’s company history states that it founded National Snack Stick Day in 2016 and ties the celebration to September 23.

RLS Awareness Day

International RLS/WED awareness observance associated with the RLS Foundation and partner patient/scientific groups; September 23; health-awareness content remains non-diagnostic and non-prescriptive

RLS Foundation materials identify September 23 as RLS Awareness Day, explain that the date is Professor Karl-Axel Ekbom’s birthday, and document a 2012 international WED/RLS awareness coali…

September equinox (Northern Hemisphere fall equinox)

Astronomical event / Northern Hemisphere seasonal naming

The U.S. Naval Observatory calculates the September equinox as an astronomical instant: 23 September 2026 at 00:05 UT and 23 September 2027 at 06:02 UT. The Northern Hemisphere calls this t…

Heritage Day

South Africa / national public holiday

Public Holidays Act 36 of 1994 lists Heritage Day on 24 September; current government material confirms continuing public-holiday status and national observance.

Lash Stylists’ Day

International beauty industry / Noble Lashes creator-defined observance

Noble Lashes’ current site lists its September 24 Lash Stylist Day initiative; current corroboration attributes creation to Noble Lashes in 2018 while the exact first recurring edition rema…

National Punctuation Day

United States / privately founded language-awareness observance

Founder interview and institutional/media coverage identify Jeff Rubin as creator, September 24 as the annual date and 2004 as the reported launch year; exact first public annual edition re…

World Maritime Day

United Nations / IMO international observance

IMO / UN observance

California Native American Day

California, United States / state observance and school-calendar framework

California Department of Education material identifies Native American Day on the fourth Friday in September, while Bureau of Indian Affairs history describes California’s state recognition…

International Ataxia Awareness Day

International ataxia-awareness effort

The National Ataxia Foundation states that International Ataxia Awareness Day is on September 25 each year and is a coordinated effort involving individuals and ataxia organizations around…

Math Storytelling Day

International / Natural Math community-created educational observance

Natural Math’s first-party toolkit says Math Storytelling Day is celebrated on September 25 and explains how Maria Droujkova and Sue VanHattum developed the observance.

Michigan Indian Day

Michigan commemorative day established by state law

Michigan Department of Civil Rights

National Cooking Day™

United States / PotsandPans.com and Meyer Corporation-created home-cooking observance

Meyer Corporation’s creator-provided 2016 release says PotsandPans.com created National Cooking Day and identifies September 25 as the observance date.

National Lobster Day

United States / U.S. Senate edition-specific commemorative recognition

GovInfo records S. Res. 905, submitted and agreed to by the U.S. Senate on September 24, 2026, designating September 25, 2026 as National Lobster Day. Earlier Senate resolutions also design…

National Psychotherapy Day

United States / Psychotherapy Foundation-origin professional and public-awareness observance

A contemporaneous 17 September 2012 GoodTherapy/Psychotherapy Foundation announcement identifies 25 September 2012 as the first annual National Psychotherapy Day.

National YogaFit Day

United States / YogaFit Worldwide-created branded yoga-community observance with current YogaFit stewardship

National Day Archives identifies YogaFit Worldwide as founder in 2019 and September 25 as the annual date. Archived 2019 calendar evidence places National YogaFit Day on September 25, and Y…

Native American Day (California)

California / state educational observance

California’s Department of Education quotes Education Code section 37220.7 and identifies the fourth Friday in September as Native American Day, including 25 September 2026.

Research Administrator Day / International Research Administrators Day

Research administration profession recognition

MIT states that Research Administrator Day on September 25 was first celebrated in 2015 by NCURA; SRA International currently uses Research Administrator Day while NCURA Region I uses Inter…

Save the Koala Day

Australia / Australian Koala Foundation campaign

The Australian Koala Foundation lists Save the Koala Day as the last Friday in September and identifies September 25 for the 2026 observance.

Sport Purple for Platelets Day

Global / Platelet Disorder Support Association awareness campaign

PDSA states that Sport Purple for Platelets Day is recognized on the last Friday of every September as part of platelet-disorder awareness work.

Tag des Deutschen Butterbrotes (German Butterbrot Day)

Germany / German bread-and-butter food-culture campaign tradition

WDR documents that the CMA established the last Friday in September as Tag des Deutschen Butterbrotes in 1999 and that the observance continued after the CMA ceased to exist in 2009.

World Dream Day

Global organizer-led participatory observance

World Dream Day’s official site states that the observance is held annually on 25 September and its current 2026 page describes the campaign’s focus on ideas, goals and dreams.

World Pharmacists Day

International / FIP-led pharmacy profession observance

International Pharmaceutical Federation states that its Council adopted World Pharmacists Day in 2009, that September 25 marks FIP’s 1912 inception anniversary, and that FIP leads the campa…

European Day of Languages

Council of Europe language-learning and linguistic-diversity observance

Council of Europe records establish the first 26 September 2001 edition and the Committee of Ministers decision of 6 December 2001 making the day annual.

Fish Amnesty Day

PETA / animal-rights campaign

PETA states that it created Fish Amnesty Day in 1997 and marks it on the fourth Saturday in September.

HR Professionals Day

Workplace/professional recognition observance

Hofstra University and employer professional communications identify September 26 as HR/Human Resource Professional Day.

International Day for the Total Elimination of Nuclear Weapons

United Nations / international observance

A/RES/68/32

International Rabbit Day

International / rabbit welfare awareness

World Animal Protection describes International Rabbit Day as occurring on the fourth Saturday of September and gives 26 September for 2026.

Mesothelioma Awareness Day

United States-centered organizer campaign with state/local proclamations

The Mesothelioma Applied Research Foundation states that Mesothelioma Awareness Day takes place annually on September 26 and was established by its community in 2004.

National Dumpling Day

United States / TMI Food Group-founded food observance

National Day Calendar records September 26 as National Dumpling Day and says TMI Food Group submitted the observance in 2015.

National Ghost Hunting Day

International / National Ghost Hunting Day paranormal-community event

The official National Ghost Hunting Day site states the event was established in 2016 and is held on the last Saturday of September.

National Hunting and Fishing Day

United States — conservation and outdoor heritage observance

U.S. Fish & Wildlife Service states Congress established the observance in 1972 and it is celebrated on the fourth Saturday in September

National Law Enforcement Suicide Awareness Day

United States / law-enforcement mental-health awareness

FBI outreach material identifies September 26 as National Law Enforcement Suicide Awareness Day; Blue H.E.L.P. states the day was created to remember officers lost to suicide and reduce sti…

National Public Lands Day

United States — nationwide public-lands volunteer observance

National Park Service current 2026 observance page; led by NEEF in partnership with NPS and federal agencies

National Seat Check Saturday

United States / NHTSA Child Passenger Safety Week campaign; edition-specific child-safety check event

NHTSA identifies National Seat Check Saturday as the closing Saturday of Child Passenger Safety Week. The agency lists September 26 for 2026 and different dates in other editions, so the da…

National Situational Awareness Day

United States / Pretty Loaded-origin personal-safety awareness campaign; non-confrontational awareness framing

Pretty Loaded states that it submitted National Situational Awareness Day in 2015 and continues to mark September 26 annually. National Day Calendar records the 2015 submission/declaration…

Save Your Photos Day

Informal photo-preservation awareness observance

The Photo Managers states it has led the Save Your Photos effort since 2014; founder Cathi Nelson describes Save Your Photos Day as the original last-Saturday-in-September format before exp…

Fête de la Communauté française

French Community of Belgium / Fédération Wallonie-Bruxelles; 27 September community observance

Belgium’s federal information service identifies 27 September as the Fête de la Communauté française, while Fédération Wallonie-Bruxelles materials continue to use the date in current calen…

Gold Star Mother's and Family's Day

United States / Gold Star family remembrance

The 2025 presidential proclamation uses Gold Star Mother's and Family's Day; 36 U.S.C. §111 separately designates the last Sunday in September as Gold Star Mother's Day.

Independence Day of Turkmenistan

Turkmenistan

The Ministry of Foreign Affairs states that 27 September is celebrated as Independence Day in Turkmenistan and lists it among public holidays.

World Rivers Day

international river-awareness and stewardship observance

World Rivers Day organizers; global initiative launched in 2005 alongside the UN Water for Life Decade

World Tourism Day

UN Tourism / United Nations / international observance

UN Tourism observance

Czech Statehood Day

Czech Republic / state holiday

Current Czech law lists 28 September as Czech Statehood Day; the page’s St. Wenceslas wording is a search-facing alias for the statehood observance.

Family Day — A Day to Eat Dinner With Your Children

United States / family-dinner campaign associated with CASA research and participating family-prevention organizations

University of Hawaiʻi material describes Family Day as an annual event launched in 2001, developed from research by the National Center on Addiction and Substance Abuse at Columbia Universi…

Fish Tank Floorshow Night

United States / creator-defined informal Wellcat observance

Wellcat Holidays lists Fish Tank Floorshow Night on September 28 and identifies Thomas and Ruth Roy as the holiday creators.

International Day for Universal Access to Information

UNESCO / United Nations / international observance

A/RES/74/5

International Right to Know Day

Access-to-information and transparency advocacy; historically used by OSCE and civil-society partners

The OSCE Mission to Serbia documented International Right to Know Day on 28 September in partnership with public institutions, UNDP, journalists and transparency groups.

National Good Neighbor Day

United States / community observance and historical congressional recognition context

The current National Good Neighbor Day organizer uses September 28. Historical congressional materials contain date-specific and fourth-Sunday recognition formulations, so the record does n…

National North Carolina Day

United States / National Day Calendar National State Days series — North Carolina

National Day Calendar lists National North Carolina Day on 28 September. The U.S. Senate records North Carolina’s admission/statehood date as 21 November 1789. The two dates are deliberatel…

Anniversary of the Victory of the Battle of Boquerón

Paraguay / Battle of Boquerón national-holiday and remembrance context

Paraguay’s Law No. 7544/2025 lists 29 September, Day of the Battle of Boquerón, as a national holiday and permits the Executive to move its observed holiday to an adjacent Monday; governmen…

International Day of Awareness of Food Loss and Waste

FAO / UNEP / United Nations / international observance

A/RES/74/209

National Coffee Day

United States / coffee-industry observance

The National Coffee Association repeatedly marks National Coffee Day around September 29, including its 2025 research release issued in advance of the September 29 observance and subsequent…

National Police Remembrance Day

Australia / national police remembrance observance

Queensland Police Service states that the tradition began in 1989 and is observed annually; Victoria Police confirms 29 September each year and documented the 2026 observance.

National Silent Movie Day

International / film-preservation observance organized by Silent Movie Day

Silent Movie Day’s organizers state that the annual celebration is held September 29 to promote silent-film exhibition and preservation.

VFW Day

Veterans of Foreign Wars / United States veterans-service organization anniversary observance

Current Veterans of Foreign Wars material states that VFW Day is commemorated each year on September 29 and ties the date to the organization’s September 29, 1899 founding. VFW history also…

Fiestas de San Jerónimo in Masaya

Masaya, Nicaragua patronal and cultural festival

Visit Nicaragua documents the San Jerónimo festivities in Masaya, including the major 30 September procession and later folkloric events.

Independence Day

Botswana / national holiday

Botswana Parliament and government sources identify 30 September 1966 as the independence/statehood date; current government calendars use Botswana Day while official commemoration material…

International Podcast Day™

International Podcast Day / global organizer-led observance

The official International Podcast Day site identifies 30 September as International Podcast Day and explains that the event was rebranded from National Podcast Day in 2015.

International Translation Day

United Nations international observance

A/RES/71/288

National Extra Virgin Olive Oil Day

United States / The Passionate Olive-created food and olive-oil education observance

The Passionate Olive published a first-party launch on August 18, 2016 for a September 30 Extra Virgin Olive Oil Day; supporting observance references identify The Passionate Olive as found…

National Love People Day

United States / Lifeline Church-created community observance

Lifeline Church’s lead-pastor biography states that he and church leaders founded National Love People Day in 2017 and that it is celebrated annually on September 30.

National Puppy Mill Survivor Day

United States / Bailing Out Benji-created puppy-mill awareness day

Bailing Out Benji states it created National Puppy Mill Survivor Day in September 2021 and that it takes place on September 30 each calendar year.

National Women’s Health & Fitness Day

United States / Health Information Resource Center organizer-led event

The official FitnessDay site states that National Women’s Health & Fitness Day is always held on the last Wednesday in September and is organized by the Health Information Resource Center.

Orange Shirt Day

Canada / Indigenous-led remembrance and awareness observance

Orange Shirt Society identifies Phyllis Webstad and other founding members as creators of Orange Shirt Day in 2013, explains the September 30 date, and continues Indigenous-led stewardship;…