April 2028 observances

Cyprus National Day

Cyprus / public-holiday calendar

Official Cyprus diplomatic material lists Cyprus National Day on 1 April among the country’s public holidays.

International Edible Book Festival / Edible Book Day

International participatory book-art/food event

The Books2Eat creator site identifies Judith A. Hoffberg and Béatrice Coron as the creators and explains the April 1 date for the International Edible Book Festival.

Every Day is Tag Day™

United States pet-identification awareness campaign

American Humane states that it created Every Day is Tag Day™ and that the nationwide pet-identification effort is held annually on the first Saturday in April.

Investiture of the Most Excellent Captains Regent

Republic of San Marino state investiture ceremony

Republic of San Marino / Visit San Marino

National Greeting Card Day

United States / Lovepop-created greeting-card observance

National Day Archives records Lovepop Cards as creator in March 2021 for an annual April 1 observance; Lovepop first-party material ties April 1 to its April 1, 2014 launch anniversary and…

National Love Our Children Day

United States / Love Our Children USA child-safety, family-support and prevention awareness observance

A creator-issued 2007 Love Our Children USA release calls National Love Our Children Day an initiative of Love Our Children USA, describes that year as the fourth annual edition, and states…

Odisha Day (Utkala Dibasa)

Odisha state observance

Chief Minister of Odisha / Government of Odisha

U.S. Air Force Academy founding anniversary

United States / U.S. Air Force Academy institutional history

The U.S. Air Force Academy’s official history states that the Academy was established on April 1, 1954. The source supports an institutional anniversary, not a distinct nationwide recurring…

A Drop of Water is a Grain of Gold

Turkmenistan

Official Turkmen government material verifies the national observance on the first Sunday in April, including a 2014 presidential decree and government-led celebrations. Original creator an…

World Autism Awareness Day

United Nations / international observance

A/RES/62/139

Geologist Day

Russia / geology profession

Russian federal geological sources trace Geologist Day to a 31 March 1966 decree of the Presidium of the Supreme Soviet of the USSR, record the first observance that April and preserve the…

International Fact-Checking Day

Organizer-backed global information-integrity observance

International Fact-Checking Network (IFCN) at Poynter

National DIY Day

Craft Box Girls-founded creativity and making campaign

Craft Box Girls states that its team launched the first National DIY Day on April 2, 2016 and established April 2 as the annual date.

Love Your Produce Manager® Day

United States / Frieda’s Specialty Produce creator-backed industry appreciation observance

Frieda’s first-party material places Love Your Produce Manager Day on April 2 and states that the company created the holiday on its 50th anniversary in 2012.

National Ride Your Horse to a Bar Day

United States / informal novelty observance attributed to Dale Garwood

National Day Archives records the day as created in April 2021 by Dale Garwood and recurring annually on April 2; Days Of The Year independently identifies Dale Garwood as founder and April…

Pascua Florida Day

Florida State Day by statute

Florida Statutes

Union State Day / Day of Unity of the Peoples of Belarus and Russia

Belarus–Russia Union State — intergovernmental observance

The official Union State portal states that April 2 has been observed as the Day of Unity of the Peoples of Belarus and Russia since the April 2, 1997 Treaty on the Union of Belarus and Rus…

Birth anniversary of National Artist Lino Brocka

Philippines / DILG cultural advocacy calendar

Philippine government cultural sources verify Lino O. Brocka’s birth on April 3, 1939 and his posthumous 1997 recognition as National Artist for Film. The inherited DILG cultural calendar l…

Fish Fingers and Custard Day

Doctor Who fandom / franchise-promoted observance

Official Doctor Who sources promote April 3 as Fish Fingers and Custard Day, say it commemorates the Eleventh Doctor’s first appearance, and date The Eleventh Hour premiere to 3 April 2010.

National Film Score Day

United States / Movie Scores and More Radio-created film-music appreciation day

National Day Calendar’s proclamation identifies Jeffrey D. Kern of Movie Scores and More Radio as founder and April 3 as the annual observance date.

International Day for Mine Awareness and Assistance in Mine Action

United Nations / international observance

A/RES/60/97

School Librarian Day

United States / school-library professional recognition

American Association of School Librarians publications identify April 4 as National School Librarian Day/School Librarian Day.

Independence Day

Senegal

Senegal’s Presidency verifies current April 4 Independence Day recurrence and Law No. 74-52 fixes April 4 as the national holiday while superseding earlier holiday provisions.

First Contact Day

Star Trek franchise / science-fiction fandom

Official Star Trek sources mark April 5 as First Contact Day, explicitly frame the April 5, 2063 human–Vulcan encounter as fictional canon, document an official 2021 real-world fan event, a…

Gold Star Spouses Day

United States military-family remembrance and recognition observance

U.S. Department of Defense source verification

International Day of Conscience

United Nations international observance

A/RES/73/329

Childhelp National Day of Hope

United States child-abuse prevention and survivor-support awareness observance

Childhelp; congressional recognition cited by the organizer

National Deep Dish Pizza Day

United States / brand-created and broadly promoted informal food observance

UNO stated in 2010 that April 5 is National Deep Dish Pizza Day and that it was first designated in 2009 for UNO’s anniversary; UNO continues to promote the observance.

National Nebraska Day

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

National Day Calendar lists National Nebraska Day on 5 April. The U.S. Senate records Nebraska’s admission/statehood date as 1 March 1867. The two dates are deliberately kept separate so th…

National Recommit to Your Fitness Day

United States / F45 Training-created fitness campaign

F45 Training launched National Recommit to Your Fitness Day in 2025 as an annual April 5 initiative; its first-party announcement says 4/5 is a nod to the F45 name.

National Walking Day

United States / American Heart Association physical-activity awareness observance

The American Heart Association states that it established National Walking Day in 2007 and celebrates it annually on the first Wednesday in April; current 2026 material confirms continuing…

Paraprofessional Appreciation Day

United States / education-community appreciation observance

AFT and Colorado Education Association materials verify Paraprofessional Appreciation Day and the first-Wednesday-in-April recurrence.

Bohring-Opitz Syndrome Awareness Day

International / Bohring-Opitz Syndrome Foundation awareness campaign

The Bohring-Opitz Syndrome Foundation states that the day takes place every 6 April, that Taylor Gurganus organized the first observance on 6 April 2015, and that the date marks the first B…

California Poppy Day

California, United States / state-designated educational observance

California Department of Education cites Education Code section 37222.12, which designates April 6 of each year as California Poppy Day.

Drowsy Driver Awareness Day

California, United States / state legislative memorial observance

California Senate Concurrent Resolution 27 proclaimed April 6, 2005 as Drowsy Driver Awareness Day and designated April 6 of every following year as the state’s memorial observance.

International Day of Sport for Development and Peace

United Nations international observance

A/RES/67/296

National Food Faces Day

United States / Holland America Line and chef Rudi Sodamin-created food-art observance

Holland America Line announced April 6 as National Food Faces Day in honor of chef Rudi Sodamin’s food-art work; observance registration corroborates the date.

National Siamese Cat Day

United States / Jace Shoemaker-Galloway-created cat adoption-awareness observance

Jace Shoemaker-Galloway’s current holiday list places National Siamese Cat Day on April 6, and UPI reports that she declared April 6, 2014 to be the first annual observance to encourage she…

National Student-Athlete Day

U.S. student-athlete recognition / NCAA participation

The NCAA marks National Student-Athlete Day on April 6 and uses the observance to recognize student-athlete accomplishments in academics, well-being and community service.

New Beer’s Eve

United States / 1933 beer-legalization history and modern beer-culture observance

Boulevard Brewing documents New Beer’s Eve on 6 April as the eve of the 1933 return of legally saleable beer under the Cullen-Harrison Act; Library of Congress material independently anchor…

Tartan Day

Canadian heritage observance

Nova Scotia traces Canada’s first Tartan Day to a 1987 provincial proclamation requested by the Federation of Scottish Culture in Nova Scotia; the Government of Canada declared April 6 Tart…

International Day of Reflection on the 1994 Genocide against the Tutsi in Rwanda

United Nations / international observance

A/RES/58/234

International Beaver Day

International / beaver conservation awareness

The Smithsonian’s National Zoo identifies 7 April as International Beaver Day, and a current municipal conservation notice also recognizes the date.

Karume Day

Tanzania public holiday and remembrance

United Republic of Tanzania government sources

Motherhood and Beauty Day

Armenia / national observance under the holidays and remembrance law; current Article 4 does not designate April 7 a non-working day

Armenia’s current holidays/remembrance law states that Motherhood and Beauty Day is observed on April 7. Historical ARLIS texts show a 1994 establishing decision and later removal of the no…

Mozambican Women’s Day (Dia da Mulher Moçambicana)

Mozambique / national holiday

Mozambique’s Government Portal lists 7 April as Dia da Mulher Moçambicana and links the holiday to remembrance of Josina Machel.

National Beer Day

United States / brewing-industry observance tied to the Cullen-Harrison Act

The Brewers Association lists National Beer Day on 7 April 2026 and explains that it commemorates the Cullen-Harrison Act taking effect on 7 April 1933.

National Girl Me Too Day

United States / Girl Me Too movement recognition day founded by Symonia Montgomery

Girl Me Too first-party material verifies April 7 and founder Symonia Montgomery. Because the organizer says the first celebration was in 2016 while National Day Calendar says 2017, the exa…

National Making the First Move Day

United States / informal bullying-prevention and recovery advocacy observance; general information only

Creator-authored material identifies Greshun De Bouse as founder of National Making the First Move Day; contemporaneous 2019 reporting documents her work to establish the April 7 observance…

World Health Day

World Health Organization global health observance

WHA/A.2/Res.35

International Roma Day

international Roma culture, rights and equality observance

Council of Europe source verification / international Roma community observance

Draw A Bird Day

International informal art/remembrance observance / creator-maintained site

The Draw A Bird Day site states that the observance is held on April 8 every year and explicitly notes that it is not an official holiday.

International Pageant Day

International pageant community / community-created recognition day

Pageant Planet’s archived podcast published for International Pageant Day identifies April 8, and observance references consistently describe the pageant-community day as an annual April 8…

National Dog Fighting Awareness Day

United States / ASPCA animal-cruelty awareness campaign

The ASPCA designated 8 April 2014 as the first National Dog Fighting Awareness Day and described the observance again as its second annual edition in 2015. Public treatment is limited to no…

Trading Cards for Grown-ups Day

United States / creator-defined informal Wellcat observance on April 8.

Wellcat’s creator calendar lists Trading Cards for Grown-ups Day on April 8 and states that Wellcat Holidays were created by Thomas and Ruth Roy; Wellcat’s creator biography documents the R…

International ASMR Day

Community/media observance associated with ASMR creators and audiences

YouTube’s official Culture & Trends blog identified 9 April 2024 as International ASMR Day; independent observance calendars consistently use 9 April as the annual date.

National Former POW Recognition Day

United States / federal former-POW remembrance observance

Federal records show Congress designated April 9, 1987 as National Former POW Recognition Day and President Reagan proclaimed it on April 8, 1987; VA materials continue annual April 9 remem…

National Mature Women’s Day

United States / Laura Geller Beauty brand-created observance

Laura Geller Beauty’s own releases identify April 9 as National Mature Women’s Day and state that the brand created the observance.

Vimy Ridge Day

Canadian national day of remembrance of the Battle of Vimy Ridge

Canada’s Vimy Ridge Day Act designates April 9 in every year as Vimy Ridge Day, and Veterans Affairs Canada continues to host annual commemorative ceremonies.

Birth anniversary of Manlilikha ng Bayan Masino Intaray

Philippines / DILG cultural advocacy calendar

The DILG Aurora advocacy calendar lists the birth anniversary of Manlilikha ng Bayan Masino Intaray on April 10 and gives 1943 as the birth year.

National Encourage a Young Writer Day

United States / informal literary and educational observance with repeated state legislative recognition

New York Senate resolutions for both 2021 and 2022 recognize April 10 in conjunction with the observance of National Encourage a Young Writer Day, independently confirming the recurring mon…

Walter Hunt safety-pin patent anniversary

Invention-history anniversary / Walter Hunt U.S. safety-pin patent

The original U.S. Patent No. 6,281 text identifies Walter Hunt’s dress-pin invention and dates the patent 10 April 1849; Smithsonian collections also identify Hunt with the safety-pin inven…

National Farm Animals Day

United States / animal-welfare awareness observance created by Colleen Paige

Observance and historical-society sources identify April 10 as National Farm Animals Day and trace its creation to Colleen Paige in 2005.

National Report IRS Tax Fraud Day

United States / privately created tax-fraud reporting awareness observance

The Hesch Firm’s contemporaneous April 5, 2018 announcement identifies Joel D. Hesch as creator and April 10 as the observance date; current IRS sources provide the authoritative reporting…

National Siblings Day

United States / Siblings Day Foundation recognition campaign

The Siblings Day Foundation states that its mission since 1995 has included establishing National Siblings Day annually on 10 April.

Día de la Batalla de Rivas

Costa Rica / statutory national commemoration

Costa Rica Legislative Assembly and cultural-history sources verify April 11 as the annual Battle of Rivas commemoration, the April 11, 1856 historical anchor and Act 8886 later date-protec…

National Barbershop Quartet Day

Barbershop Harmony Society / organized barbershop commemoration

The Barbershop Harmony Society says National Barbershop Quartet Day commemorates the birth of the organized barbershop movement on 11 April 1938.

Dog Therapy Appreciation Day

Informal pet/therapy-animal appreciation calendar usage documented by a veterinary institution

The Animal Medical Center repeatedly lists Dog Therapy Appreciation Day on April 11 in annual pet-awareness calendars.

International Be Kind To Lawyers Day

International / creator-led legal-profession observance

NACUA identifies Steve Hughes as creator and states that International Be Kind To Lawyers Day recurs on the second Tuesday in April; a contemporaneous 2008 archive documents the first editi…

International Louie Louie Day

Grassroots music/fan observance centered on the song “Louie Louie”

The Louie Louie advocacy/fan community documents International Louie Louie Day and its April 11 tradition, developed through the Louie Louie Advocacy and Music Appreciation Society ecosyste…

National Cheese Fondue Day

United States / informal food observance repeatedly promoted by The Melting Pot

The Melting Pot’s first-party 2025 material identifies April 11 as National Cheese Fondue Day, continuing a long-running brand celebration.

Marketing Operations Appreciation Day

Professional/workplace / Zapier-created Marketing Operations Appreciation Day

Zapier’s own 2023 campaign page states that Marketing Operations Appreciation Day is April 11 and describes it as an annual recognition initiative.

World Parkinson's Day

Organizer-backed international observance

Parkinson's Europe and the international Parkinson’s community

National Pet Day

United States-origin / creator-led pet observance with public-institution recognition

Founder Colleen Paige’s current holiday list places National Pet Day on April 11, and the U.S. Census Bureau lists National Pet Day on April 11 in its current April resources.

National Ranch Water Day

United States / RANCH2O Spirits-created beverage observance

RANCH2O Spirits currently states that it gave Ranch Water a national holiday and publishes April 11; the creator-submitted National Day Archives record dates creation to February 2021 and a…

Cosmonautics Day

Russian Federation / national space commemoration

Current Russian government material recognizes April 12 as Cosmonautics Day; the United Nations independently verifies 12 April 1961 as Yuri Gagarin’s first human space flight, which anchor…

World Hamster Day

Informal animal-awareness calendar usage; canonical source wording is “World Hamster Day”

The Animal Medical Center repeatedly lists World Hamster Day on April 12 in annual pet-awareness calendars.

International Day of Human Space Flight

United Nations / international observance

A/RES/65/271

International Day for Street Children

global street-connected children rights and participation campaign

Consortium for Street Children states that it launched International Day for Street Children and continues the annual 12 April observance focused on rights, dignity and participation.

International Day of Pink

International anti-bullying, anti-discrimination and inclusion campaign; current organizer material especially centers 2SLGBTQIA+ inclusion and school/community education

International Day of Pink first-party campaign material verifies the second-Wednesday-in-April cadence and current 2026/2027 editions; archived Government of Canada material independently d…

Walk on Your Wild Side Day

United States / creator-defined informal Wellcat observance on April 12.

Wellcat’s creator calendar lists Walk on Your Wild Side Day on April 12 and identifies Wellcat Holidays as creations of Thomas and Ruth Roy; independent observance coverage also credits Tho…

International FND Awareness Day

FND Hope International / awareness campaign

FND Hope International documents recurring International FND Awareness Day campaigns on 13 April, including the fifth annual edition in 2017 and sixth annual edition in 2018; current FND Ho…

National Borinqueneers Day

United States recognition of the 65th Infantry Regiment / Borinqueneers

U.S. Senate Resolution 641 (2020) and subsequent federal recognition

National Make Lunch Count Day

United States / TGI Fridays-created lunch-break campaign observance

National Day Calendar and launch-era material attribute the 2016 observance to TGI Fridays and place it on April 13.

National Silly Earring Day

Creator-led lifestyle observance / Olena Kagui and Oddity Cart

Olena Kagui’s April 5, 2021 first-party founding announcement states that National Silly Earring Day is celebrated annually on April 13; National Day Archives corroborates Kagui as creator…

Thomas Jefferson's birthday

United States / federal birthday commemoration

36 U.S.C. §141 requires an annual presidential proclamation inviting April 13 commemoration of Thomas Jefferson’s birthday and flag display on federal buildings. The source resolution dates…

U.S. Air Force Reserve Birthday

United States / Air Force Reserve

Air Force Reserve Command materials mark 14 April 2026 as the Air Force Reserve’s 78th anniversary.

Birth anniversary of Dr. B. R. Ambedkar

India

Government and Dr. Ambedkar Foundation sources verify annual 14 April birth-anniversary commemoration; 14 April 2026 was separately declared a Central Government office holiday by year-spec…

National Donate Life Blue & Green Day

United States / Donate Life America organ, eye and tissue donation awareness campaign

Donate Life America states National Donate Life Blue & Green Day is observed on the second Friday of April each year; New York State health authorities documented the April 10, 2026 observa…

National Fast and Prayer Day

Liberia / national fast-and-prayer observance

Liberian government sources tie the second-Friday-in-April national holiday to an 1883 Act, identify the current legal framework, and document continuing presidential proclamation practice…

National Gardening Day

United States / widely recognized gardening observance with current USDA NIFA recognition

USDA’s National Institute of Food and Agriculture lists April 14 as National Gardening Day in its 2026 social-media toolkit.

Pan American Day

Organization of American States hemispheric commemoration

Organization of American States

Pathologists’ Assistants Day

International / American Association of Pathologists’ Assistants professional recognition

The American Association of Pathologists’ Assistants identifies April 14 as PA Day/Pathologists’ Assistants Day and has repeatedly promoted the annual professional recognition.

World Chagas Disease Day

WHO / international observance

WHO observance

Hari Perisytiharan Melaka Sebagai Bandaraya Bersejarah

Melaka, Malaysia / state commemorative observance

Melaka state history records the Historical City declaration on 15 April 1989, while a Malaysian government calendar carries the proclamation-day observance on 15 April.

International Wellness Day

United Nations / international observance

A/RES/80/249

Jackie Robinson Day

Major League Baseball / league-wide observance

MLB states that every April 15 baseball honors Jackie Robinson’s legacy and that April 15 has been dedicated as Jackie Robinson Day each year since 2004; MLB also documented the 2026 league…

One Boston Day

City of Boston annual civic day

City of Boston material documents the 2015 beginning of One Boston Day, a 2016 mayoral proclamation permanently designating April 15, and continuing City stewardship in 2026.

RMS Titanic sinking anniversary

International maritime-history remembrance / historical anniversary of the RMS Titanic sinking

NOAA verifies that RMS Titanic sank on 15 April 1912 and describes the protected wreck site as a memorial. The record is a historical anniversary and does not assert creation of a separatel…

Universal Day of Culture under the Banner of Peace

International Roerich/Banner of Peace cultural movement

Nicholas Roerich’s writings proposed a World/Universal Day of Culture, and the international movement dedicated to the initiative identifies 15 April as its observance.

World Art Day

UNESCO world day

World Circus Day

Global / Fédération Mondiale du Cirque observance

The Fédération Mondiale du Cirque maintains World Circus Day on the third Saturday in April. Contemporaneous Federation press-release material identifies 17 April 2010 as the inaugural Worl…

José de Diego Commemoration Day

Puerto Rico / statutory commemorative day honoring José de Diego; not a public holiday

Puerto Rico law preserves April 16 as a commemorative day for José de Diego while distinguishing it from the consolidated Próceres public holiday.

Foursquare Day (4SQDay)

Foursquare user/Superuser community / brand-community observance

Foursquare’s own material describes 4SQDay as an annual community holiday centered on April 16, with community events sometimes scheduled around that date.

International Documentary Day

International / filmmaker-led documentary appreciation observance launched in 2026

Organizer-side launch material describes April 16 as an annual documentary observance beginning in 2026, and current calendar coverage likewise specifies April 16 every year.

National Bean Counter Day

United States / informal accounting-profession appreciation observance; informational only, not tax or financial advice

National Day Calendar credits Connecticut CPA Kevin Wenig with founding National Bean Counter Day on April 16; Hartford Business Journal independently identified Wenig as the local accounta…

National Healthcare Decisions Day

United States / advance-care-planning awareness initiative

The Conversation Project states that National Healthcare Decisions Day is an annual April 16 initiative founded in 2008 by attorney Nathan Kottkamp to encourage advance-care-planning conver…

World Voice Day

international voice awareness observance

World Voice Day Committee and international voice-health community

World Mustang Day

Ford / Mustang heritage celebration

Ford first-party material identifies April 17 as World Mustang Day and ties the date to the Mustang’s public introduction on 17 April 1964; creator/first formal edition remain unresolved.

Malbec World Day

Argentine Malbec wine and cultural-promotion observance

Wines of Argentina / Malbec World Day

Evacuation Day (Independence Day)

Syria / national public-holiday calendar

The Syrian Arab Republic’s current eAIP public-holiday table, effective 27 March 2026, lists 17 April as Evacuation Day (Independence Day).

International Day for Monuments and Sites

ICOMOS international heritage observance; concept adopted by UNESCO in 1983

International Council on Monuments and Sites (ICOMOS)

National Animal Crackers Day

United States / informal food observance

National Day Archives lists the canonical plural National Animal Crackers Day on April 18; the public singular title is retained as an alias.

National Bunion Day

United States / Treace Medical Concepts bunion-awareness campaign; commercial-origin awareness day, not a government/statutory health observance

Treace Medical Concepts announced the first-ever National Bunion Day in the United States on 16 April 2024, states that it founded the observance, and sets it on the third Tuesday of April…

National Exercise Day

United States / informal registered wellness observance

National Day Archives lists National Exercise Day on April 18 and identifies Jeuse Saint-Fleur, DNP as its creator in 2020.

National Newspaper Columnists Day

United States newspaper-columnist recognition observance

National Society of Newspaper Columnists first-party history says the society passed a resolution establishing April 18 as National Columnists Day, first marked it in 1995, and chose the an…

World Amateur Radio Day

International / IARU amateur-radio observance; participation remains subject to applicable licensing and operating rules

The International Amateur Radio Union states that World Amateur Radio Day is celebrated every April 18, the anniversary of IARU’s formation in Paris in 1925. IARU Resolution 94-3 establishe…

Congenital Diaphragmatic Hernia Awareness Day

Health-awareness observance organized and promoted by the CDH community

CDH International identifies 19 April as Congenital Diaphragmatic Hernia Awareness Day; historic proclamations also document the observance.

National Amaretto Day

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

Two Association of Nutrition & Foodservice Professionals chapter calendars list National Amaretto Day on 19 April.

National Cat Lady Day

International / CatCon-created cat-lover celebration

CatCon states that founder Susan Michals created National Cat Lady Day in 2017 and that it takes place each year on April 19.

National North Dakota Day

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

National Day Calendar lists National North Dakota Day on 19 April. The U.S. Senate records North Dakota’s admission/statehood date as 2 November 1889. The two dates are deliberately kept se…

Oklahoma City Bombing Anniversary / Annual Remembrance Ceremony

Oklahoma City bombing remembrance; the canonical “National ... Commemoration Day” title is not treated as a federal holiday designation

The Oklahoma City National Memorial & Museum maintains an annual April 19 Remembrance Ceremony and NPS anchors the memorial scope. Proclamation 6880 designated April 19, 1996 as a one-time…

Chinese Language Day

United Nations / international observance

United Nations language observance

National Death Doula Day

United States / Doulagivers-created end-of-life doula awareness day

Doulagivers identifies April 20 as National Death Doula Day, and observance-registration records trace its creation to Doulagivers in 2019.

National High Five Day

United States-origin community observance / National High Five Day project

Official project material verifies a 2002 University of Virginia student origin and third-Thursday-in-April recurrence.

National Look Alike Day

United States / informal resemblance and pop-culture observance; consent- and privacy-safe

National Day Calendar preserves creator Jack Etzel’s first-person account of originating the observance in Pittsburgh in the 1980s and contacting Chase’s Calendar, while Pittsburgh Magazine…

San Jacinto Day

Texas state holiday / recognition day

Texas legislative records establish the 1836 historical anchor, the 1874 state-holiday action and current Government Code §662.003(b).

National Bulldogs Are Beautiful Day

United States / informal bulldog-appreciation and acceptance observance; creator-attributed and institutionally recurring rather than statutory

Independent pet/holiday coverage attributes the observance to children’s author Jackie Valent in 2007, while current Truman State University and Drake University materials independently con…

National Pet CBD Day

United States / Innovet-created informal pet-CBD awareness and promotional observance

Innovet announced National Pet CBD Day for April 21 in 2019; archival observance material continues to identify April 21 and Innovet as the creator.

National Tea Day

United Kingdom / Tea Group organizer-led observance

The National Tea Day organizer site publishes the observance on 21 April and lists the 2026 National Tea Day edition for 21 April 2026.

Tiradentes Day

Brazil national holiday

Brazilian federal law makes 21 April a national holiday; Law 1,266/1950 established the Tiradentes holiday, Law 4,897/1965 added civic-patron and annual-commemoration provisions, and Law 10…

World Creativity and Innovation Day

United Nations / international observance

A/RES/71/284

World Curlew Day

international curlew conservation awareness observance coordinated by Curlew Action

Curlew Action verifies April 21, Mary Colwell’s origin role, explicit date rationale and continuing annual stewardship; because first-party pages use 2017 founding language and 2018 “got go…

Earth Day

Worldwide / EARTHDAY.ORG campaign

EARTHDAY.ORG’s current 2026 page identifies Earth Day 2026 as Wednesday, 22 April.

National Girl Scout Leader’s Day

Girl Scouts / volunteer-recognition observance

Current Girl Scout council resources identify April 22 as Girl Scout Leader’s Day; contemporaneous April 1982 reporting identifies April 22, 1982 as the first nationwide observance and attr…

“In God We Trust” coinage anniversary

United States / anniversary of the 1864 law authorizing the motto on coinage

U.S. Mint and Library of Congress history identify 22 April 1864 as the date Congress authorized the motto on the two-cent coin. That supports an anniversary anchor; it does not establish a…

International Mother Earth Day

United Nations international environmental observance

A/RES/63/278

Stephen Lawrence Day

United Kingdom remembrance and anti-discrimination observance

The Stephen Lawrence Day Foundation states that the day takes place every year on 22 April, the anniversary of Stephen Lawrence’s death, and its timeline records that Prime Minister Theresa…

U.S. Army Reserve Birthday

United States / U.S. Army Reserve

The U.S. Army Reserve’s official birthday page identifies 23 April 2026 as its 118th birthday.

Canada Book Day

Canada / literary observance

Canadian House of Commons records identify April 23 Canada Book Day as a distinct Canadian observance, name Lawrence Martin as its brainchild and the Writers’ Trust of Canada as organizer,…

English Language Day

United Nations / international observance

United Nations language observance

National English Muffin Day

United States / Thomas’ English Muffins brand observance

Thomas’/Bimbo Bakeries USA press materials identify April 23 as National English Muffin Day across multiple years.

Spanish Language Day

United Nations / international observance

United Nations language observance

Talk Like Shakespeare Day

Chicago-origin Shakespeare cultural observance

Illinois Register proclamation text records that Chicago Shakespeare Theater created Talk Like Shakespeare Day on Shakespeare’s birthday, April 23, and had marked it for several years.

World Book and Copyright Day

UNESCO international observance

UNESCO 28 C/Resolution 3.18

World Book Night

United Kingdom / The Reading Agency adult-reading campaign

The official World Book Night history states that the campaign was first celebrated in the UK and Ireland on 5 March 2011, moved to 23 April in 2012, and is now run in the UK by The Reading…

World Table Tennis Day

ITTF/ITTF Foundation-backed global table-tennis participation and inclusion observance

ITTF and ITTF Foundation first-party material verifies annual observance since 2015, former April 6 scheduling, current Foundation stewardship and the official move to April 23 from 2023 to…

Día de Acción por la Tolerancia y el Respeto entre los Pueblos

Argentina — national statutory commemoration

Argentina Law 26.199

International Day of Multilateralism and Diplomacy for Peace

United Nations / international observance

A/RES/73/127

National Pet Care for All Day

United States / East Bay SPCA-founded accessible-pet-care awareness day

East Bay SPCA first-party records establish National Pet Care for All Day on April 24, 2024, identify that date as the first celebration, and tie it to the organization’s 150th anniversary…

World Day for Animals in Laboratories

International / animal-research advocacy observance

The campaign’s official history identifies 24 April and traces the observance to 1979; NAVS also marks the date in current advocacy material.

APOL1-Mediated Kidney Disease (AMKD) Awareness Day

United States / American Kidney Fund-led kidney-disease awareness campaign

The American Kidney Fund provides an AMKD Awareness Day proclamation template that places the observance on the last Tuesday of each April, and its 2026 campaign materials mark 28 April 202…

Anzac Day

Australia / national day of commemoration under the Anzac Day Act 1995 (Cth)

Australian Department of Veterans’ Affairs sources verify 25 April as Anzac Day every year, state that Acting Prime Minister George Pearce officially named 25 April ‘Anzac Day’ in 1916, and…

Freedom Day / 25 April

Portugal national civic commemoration and mandatory public holiday

Portugal’s parliament identifies 25 April 1974 as the date the Armed Forces Movement ended the Estado Novo dictatorship and opened the path to democratic government. Current Portuguese gove…

International Day for Small Island Developing States

UNESCO international day

Proclaimed by UNESCO in 2025

International Delegate's Day

United Nations / international observance

A/RES/73/286

National DNA Day

NHGRI-led genetics and genomics education / U.S.-based initiative with broad participation

NHGRI says National DNA Day is celebrated annually on April 25 and commemorates the Human Genome Project completion and the discovery of the DNA double helix.

National Parvo Awareness Day

United States / Elanco-founded canine parvovirus awareness campaign

Elanco states that it launched the first National Parvo Awareness Day on 23 April 2024 and that the day recurs on the fourth Tuesday in April; independent veterinary guidance supports preve…

Parental Alienation Awareness Day

Advocacy / family-awareness observance associated with Parental Alienation Awareness organizations

The UK Charity Commission record for Parental Alienation Awareness describes an annual event held on April 25; New York Senate records also document April 25 awareness recognition.

Red Hat Society Day

Red Hat Society community anniversary/celebration

Red Hat Society first-party material identifies 25 April as its official birthday and the anniversary of the first gathering on 25 April 1998.

School Bus Driver Appreciation Day

United States / school-community driver appreciation observance

Current school-government communications and a New York State Assembly member page identify School Bus Driver Appreciation Day as the fourth Tuesday in April; in 2026 that is 28 April.

Sinai Liberation Day

Egypt / national Sinai liberation commemoration

Egypt’s State Information Service states that the anniversary of Sinai Liberation is commemorated on April 25 each year; the 2026 presidential address marked the 44th anniversary.

World Malaria Day

World Health Organization global health observance

WHO observance

World Penguin Day

International / penguin conservation awareness

Penguins International’s World Penguin Day page identifies 25 April as the observance date and frames it around penguin awareness and conservation.

Alien Day

Alien franchise fandom/brand event; date references LV-426 and is not a civic holiday

20th Century Studios’ official Alien page preserves first-party “Alien Day” franchise videos; studio-backed franchise activity has used 26 April as Alien Day.

Hug an Australian Day

United States-origin / creator-defined informal Wellcat observance themed around Australians

The first-party Wellcat Holidays calendar lists Hug an Australian Day on April 26 and identifies the collection as created by Thomas and Ruth Roy.

International Chernobyl Disaster Remembrance Day

United Nations / international observance

A/RES/71/125

International Guide Dog Day

International guide-dog community / IGDF

The International Guide Dog Federation states that International Guide Dog Day is celebrated on the last Wednesday in April each year and raises awareness of guide-dog services and their ro…

ASPCA Help a Horse Day

United States / ASPCA equine-welfare campaign

ASPCA materials identify April 26 as its annual Help a Horse Day, used to support equine rescues and adoption awareness.

National Kids & Pets Day

United States / Colleen Paige-created child-and-pet awareness day

Founder Colleen Paige states that she created National Kids & Pets Day in 2005 and her current holiday listing places it on April 26. The exact first completed edition and reason for select…

National South Dakota Day

United States / National Day Calendar National State Days series — South Dakota

National Day Calendar lists the private National South Dakota Day on April 26. The U.S. Senate records South Dakota’s admission on November 2, 1889, and South Dakota law separately establis…

Stop Food Waste Day

International / Compass Group-founded food-waste campaign

Compass Group first-party material verifies a 2017 U.S. launch, the first edition on 28 April 2017, global expansion in 2018 and the current annual rule of the last Wednesday in April.

World Burlesque Day

International / creator-led burlesque community observance

The official World Burlesque Day site identifies April 26 as the annual date, Sapphira as creator and April 26, 2020 as the first edition.

World Intellectual Property Day

WIPO / United Nations / international observance

WIPO observance

Day of Uprising Against the Occupation

Slovenia / national holiday

The Government of Slovenia lists April 27 as Day of Uprising Against the Occupation among the country’s national holidays.

Freedom Day

South African national public holiday and democratic commemoration

South African Government and the Public Holidays Act 36 of 1994 establish April 27 Freedom Day public-holiday status and link the date to the first democratic elections of 27 April 1994.

International Girls In ICT Day

International Telecommunication Union observance

Lapu-Lapu Day / Adlaw ni Lapu-Lapu

Philippines special working public holiday nationwide; special nonworking holiday in Lapu-Lapu City

Republic Act No. 11040

Samuel F. B. Morse birthday anniversary

Technology/history anniversary anchored to Samuel F. B. Morse’s birth date

The Smithsonian National Portrait Gallery records Samuel Finley Breese Morse’s birth date as 27 April 1791 and identifies him with the invention of the telegraph.

National Devil Dog Day

United States / Sean Alexander Sobel-created snack-cake observance

National Day Calendar credits Sean Alexander Sobel as founder and records a 2018 private registrar proclamation for April 27. Drake’s product history and Marine Corps historical scholarship…

Independence Day

Sierra Leone

Sierra Leone Parliament verifies the April 27, 1961 independence date and current Presidency/government materials confirm April 27 Independence Day recurrence and public-holiday treatment.

Take a Child to Work Day and Beyond

United States-origin / participating workplaces, schools, families and youth programs

Junior Achievement is the current steward after completing acquisition in 2024 and rebranding the 1993 event lineage as Take a Child to Work Day and Beyond for 2025; Ms. Foundation sources…

Independence Day

Togo

Togo’s current Constitution states that the national holiday is celebrated every year on April 27, while current Presidency material ties the independence anniversary to 1960.

International Design Day

international design-profession observance

International Council of Design identifies International Design Day as the current name, held 27 April to commemorate the Council’s 1963 founding, and says the event was celebrated as World…

World Tapir Day

International tapir-awareness and conservation observance

World Tapir Day first-party material verifies annual April 27 observance since 2008 and an organizer/community mission centered on tapir awareness and conservation. A 2018 first-party retro…

National Day of Mourning for persons killed or injured in the workplace

Canada / statutory workers’ remembrance

The Government of Canada states that the Workers Mourning Day Act established April 28 as the official day observed every year, and current 2026 federal material continues to mark the Day o…

Arbor Day

United States-origin tree-planting and stewardship observance; National Arbor Day is the last Friday in April while state dates can differ by planting climate.

Arbor Day Foundation history verifies J. Sterling Morton’s January 4, 1872 proposal, the first Arbor Day on April 10, 1872, the 1874 Nebraska proclamation, the 1885 state-holiday stage and…

National Blueberry Pie Day

United States / blueberry-industry observance

The U.S. Highbush Blueberry Council explicitly states that National Blueberry Pie Day is celebrated on April 28 each year and repeats the date in other campaign materials.

National Hairball Awareness Day

United States / cat-health awareness observance

The Animal Medical Center’s 2026 veterinary-awareness calendar and National Day Calendar both place Hairball Awareness Day on the last Friday in April.

Save The Frogs Day

International / SAVE THE FROGS! organizer campaign

SAVE THE FROGS! states that Save The Frogs Day takes place on April 28 every year and documents the 18th annual event on April 28, 2026.

Undiagnosed Children’s Day

United Kingdom / SWAN UK and Genetic Alliance UK awareness campaign

Genetic Alliance UK states that Undiagnosed Children’s Day is an annual SWAN UK awareness day on the last Friday in April and lists April 24 for 2026. SWAN UK is run by Genetic Alliance UK;…

Workers Memorial Day

International trade-union commemoration

The International Labour Organization states that 28 April has been associated since 1996 with the international trade union movement’s commemoration of victims of occupational accidents an…

World Day for Safety and Health at Work

ILO / United Nations / international observance

ILO observance

Bob Wills Day

Turkey, Texas Western Swing heritage festival

The official Bob Wills Day organizer and Turkey, Texas material identify the annual event and its last-Saturday-in-April tradition.

Independent Bookstore Day

United States / American Booksellers Association national independent-bookstore celebration

The American Booksellers Association identifies Independent Bookstore Day as a national one-day celebration held on the last Saturday in April and currently lists April 24, 2027 as the 14th…

International Dance Day

international dance and performing-arts observance

International Theatre Institute states that its Dance Committee founded International Dance Day in 1982 and that it is celebrated every 29 April, Jean-Georges Noverre’s birthday anniversary.

International Day in Memory of the Victims of Earthquakes

United Nations / international observance

A/RES/79/285

International Sculpture Day

Worldwide sculpture and visual-arts observance / International Sculpture Center

International Sculpture Center states that it inaugurated International Sculpture Day in 2015 and that the observance occurs on the last Saturday of April every year.

National First Ladies Day

United States / National First Ladies Day Commission recognition initiative

The National First Ladies Day Commission says the observance was founded in 2021 and schedules its annual celebration on the last Saturday in April.

National Pool Opening Day

Leslie’s-organized seasonal pool-care observance

Leslie’s first-party material identifies National Pool Opening Day as the last Saturday in April and documents current company participation; founder and first-edition claims remain unresol…

National Rebuilding Day

Rebuilding Together / U.S. volunteer home-repair and community revitalization service

Rebuilding Together says National Rebuilding Month culminates with National Rebuilding Day on the last Saturday of April, a timing that honors the history of its 1973 founding lineage.

National Shrimp Scampi Day

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

Two Association of Nutrition & Foodservice Professionals chapter calendars list National Shrimp Scampi Day on 29 April.

National Supply Chain Day®

United States / Supply Chain Now-led industry celebration

Supply Chain Now’s official National Supply Chain Day page states that the celebration takes place every April 29 and identifies Mary Kate Love as founder; current 2026 programming confirms…

World Tai Chi & Qigong Day

WorldTaiChiDay.org-organized global Tai Chi and Qigong education and participation observance

WorldTaiChiDay.org identifies Bill Douglas and Angela Wong Douglas as co-founders, organizes the annual global event, and sets the last-Saturday-in-April rule; a direct founder interview id…

World Veterinary Day

World Veterinary Association-created global veterinary-profession observance

The World Veterinary Association states that it created World Veterinary Day in 2000 for annual observance on the last Saturday of April and continues to lead the campaign, including 25 Apr…

World Wish Day

global wish-granting awareness and support observance

Make-A-Wish International verifies World Wish Day on April 29, its connection to the April 29, 1980 wish that inspired the movement, and continuing global stewardship in 2026; the exact fir…

International Jazz Day

UNESCO / international observance

UNESCO 36 C/Resolution 39

National Military Brats Day

United States / unofficial recognition day for current and former children of military personnel

Military Brats Registry’s origin page, dated January 2, 2015 and currently maintained, proposes congressional recognition while itself naming April 30 each year as the unofficial Military B…

Deaf Parents Day (Mother Father Deaf Day)

International CODA community / Deaf-parent and family heritage observance

CODA International designates the last Sunday in April as Deaf Parents Day, also known as Mother Father Deaf Day; CODA Korea independently describes the same last-Sunday-in-April recurrence.

National Adopt a Shelter Pet Day

United States / animal-adoption awareness usage

ASPCA material identifies April 30 as National Adopt a Shelter Pet Day, and a municipal animal shelter calendar also schedules the 2026 observance on April 30.

National Animal Advocacy Day

United States / animal-protection advocacy observance

The ASPCA explicitly promotes National Animal Advocacy Day on 30 April, and New York legislative resolutions provide additional civic recognition.

National Bubble Tea Day

United States / Kung Fu Tea-created bubble-tea celebration

Kung Fu Tea states that it founded National Bubble Tea Day on April 30, 2018, its eighth birthday, to celebrate the bubble-tea community; this verifies the modern observance, not invention…

National Pet Parents Day

United States / pet-owner appreciation observance

The Animal Medical Center’s 2026 calendar and National Day Calendar identify National Pet Parents Day as the last Sunday in April.

National Raisin Day

United States / informal food observance with documented 1909 California raisin-grower lineage

Contemporary 1909 reporting documents an April 30 Raisin Day campaign organized by California raisin growers; USDA history records Fresno’s first Raisin Day parade on April 30, 1909 and ann…

National Therapy Animal Day

Pet Partners / therapy-animal community

Pet Partners states that it created National Therapy Animal Day in 2015 and currently recognizes April 30 with annual participation and local-proclamation resources.

Our Lady of Africa

Catholic / Missionaries of Africa and Missionary Sisters of Our Lady of Africa patronal feast

Missionaries of Africa and Missionary Sisters of Our Lady of Africa first-party sources consistently document April 30 as the feast/patronal feast of Our Lady of Africa. Congregational hist…

National Holiday of the Turkmen Horse

Turkmenistan / national Akhal-Teke horse celebration

Turkmenistan government sources state that the National Holiday of the Turkmen Horse is celebrated annually on the last Sunday of April.

Walpurgis Night

Sweden / Valborg spring tradition; country-specific variants remain distinct

Visit Sweden identifies Walpurgis Eve (Valborg) on 30 April as a recurring Swedish spring tradition with bonfires, singing and community gatherings, while May Day on 1 May is a separate pub…

Worldwide Pinhole Photography Day

Worldwide Pinhole Photography Day organizers / international event

The organizer states that WPPD is held on the last Sunday in April; the official archive reaches back to 2001, and founding-history sources identify 29 April 2001 as the first edition after…