Source-backedFixed AnnualIn-depth guide
Merchant Navy Day
GOV.UK marks Merchant Navy Day on 3 September and describes the contribution of merchant seafarers
Observance library
Browse all researched observances
2,411 researched observances. Search for a specific name or known alternate name.
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Mesothelioma Awareness Day
The Mesothelioma Applied Research Foundation states that Mesothelioma Awareness Day takes place annually on September 26 and was established by its community in 2004.
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Mexico Independence Day
The Organization of American States’ current country page lists Mexico National Independence Day as 16 September.
Source-backedRule Based AnnualIn-depth guide
MFG Day / Manufacturing Day
NIST documents the launch of Manufacturing Day for 5 October 2012 by FMA, NIST MEP, WMEP and IMEC; the current MFG Day program is an initiative of The Manufacturing Institute and centers ma…
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Michigan Indian Day
Michigan Department of Civil Rights
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Mickey Mouse Birthday
Disney first-party sources treat November 18, 1928—the release/premiere date associated with Steamboat Willie—as Mickey Mouse’s birthday convention and continue to mark November 18.
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Micro-, Small and Medium-sized Enterprises Day
A/RES/71/279
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Mid-Autumn Festival
The General Office of China’s State Council sets the 2026 Mid-Autumn Festival public-holiday period at 25–27 September.
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Midsummer / Midsummer Eve and Midsummer Day
Visit Sweden states that Midsummer Eve is always a Friday between 19 and 25 June and gives 25 June for 2027. Sweden’s public-holiday law defines Midsummer Day as the Saturday falling betwee…
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Midsummer Day
The Government Offices of Sweden public-holiday circular lists Midsummer Day on 20 June 2026.
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Military Women’s Memorial anniversary
The Military Women’s Memorial says the completed memorial was dedicated and opened on October 18, 1997, and first-party anniversary programming continues to mark October 18.
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Mindanao Week of Peace
Philippine Proclamation No. 127 (2001) declares the last Thursday of November through the first Wednesday of December of every year thereafter as Mindanao Week of Peace.
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Minnie Mouse Birthday
Disney first-party sources state that Minnie Mouse debuted alongside Mickey in Steamboat Willie on November 18, 1928 and treat November 18 as both characters’ birthday convention.
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Mizoram Statehood Day
The official Lok Bhavan Mizoram document register publishes “Mizoram Statehood Day, 2026” dated 20 February 2026. The site inventory wording “Mizoram State Day” is retained for search match…
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Mole Day
The National Mole Day Foundation observes Mole Day on October 23 from 6:02 a.m. to 6:02 p.m., using the 6.02 × 10^23 notation for the Avogadro constant as the date-and-time mnemonic; its hi…
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Monday of the Holy Spirit
Greek Orthodox lectionary guidance identifies Monday in the first week after Pentecost as the Day of the Holy Spirit; the 2026 Greek Orthodox calendar places it on June 1.
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Moshoeshoe’s Day
Lesotho government sources commemorate Moshoeshoe I on 11 March, and the official holiday calendar lists the day as a public holiday. Government history frames 11 March as remembrance of th…
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Mother Teresa Day (Dita e Nënë Terezës)
Current Albanian official calendars recognize September 5 as Saint Teresa Sanctification Day. Albanian government legislative/ceremonial material documents replacement of the former October…
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Motherhood and Beauty 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…
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Mothering Sunday
Church of England liturgical material permits Mothering Sunday to be celebrated on the Fourth Sunday of Lent
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Mother’s Day
Article 30 of Georgia’s current Labour Code lists March 3 as Mother’s Day among statutory holidays; the Public Defender states that the date has been celebrated in Georgia since 1991.
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Mother’s Day in Egypt
Egyptian State Information Service confirms a recurring 21 March social Mother’s Day, proposed by Ali Amin in December 1955 and first held 21 March 1956; not a statutory day off.
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Mother’s Day in Malawi
Malawi’s Public Holidays Act schedule lists Mothers’ Day on 15 October as a public holiday. The consolidated schedule reflects later amendments, so the Act’s 1967 commencement is not treate…
Source-backedRule Based AnnualIn-depth guide
Mother’s Day in Norway
Norwegian institutional reference sources place Mother’s Day on the second Sunday in February and trace the first Norwegian observance to February 9, 1919, with later nationwide promotion a…
Source-backedRule Based AnnualIn-depth guide
Mother’s Day — United States statutory observance
36 U.S.C. §117 designates the second Sunday in May as Mother’s Day and requests a presidential proclamation. Library of Congress sources trace the national campaign to Anna Jarvis and the 1…
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Mountain Day (山の日)
Japan’s Act on National Holidays, as amended by Act No. 43 of 2014, establishes Mountain Day on 11 August and states its purpose as providing an opportunity to become familiar with mountain…
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Mozambican Heroes Day (Dia dos Heróis Moçambicanos)
Mozambique’s government lists February 3 as Dia dos Heróis Moçambicanos among national holidays. Government and presidential material connect the date to Eduardo Mondlane’s death on 3 Febru…
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Mozambican Women’s Day (Dia da Mulher Moçambicana)
Mozambique’s Government Portal lists 7 April as Dia da Mulher Moçambicana and links the holiday to remembrance of Josina Machel.
Source-backedFixed AnnualIn-depth guide
Mtskhetoba-Svetitskhovloba
Georgia’s Labour Code and national tourism office identify 14 October as Mtskhetoba-Svetitskhovloba, a Georgian public holiday rooted in local Orthodox tradition.
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Mule Day
The City of Columbia traces the tradition to 1840s “Breeder’s Day,” identifies 1934 as the first official Mule Day, and describes its evolution into a multi-day festival. The official Mule…
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Museum Selfie Day
Museum and government cultural sources identify Museum Selfie Day as a Mar Dixon-created annual campaign on the third Wednesday of January.
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Music Festival Stars of the White Nights
Mariinsky Theatre identifies Valery Gergiev as founder of Stars of the White Nights in 1993, describes it as an annual major festival, and publishes the XXXIV edition from 29 May through 24…
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Mwalimu Nyerere Day
Tanzanian government diplomatic mission holiday calendars identify October 14 as the Tanzanian public holiday for Mwalimu Julius Nyerere.
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Mărțișor
UNESCO’s Representative List records the multinational element “Cultural practices associated to the 1st of March” for Bulgaria, North Macedonia, the Republic of Moldova and Romania, inscri…
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Naadam
Mongolian government guidance lists Naadam as a July 11–15 public holiday; UNESCO’s 2010 inscription documents the July 11–13 core national festival and its living cultural-heritage charact…
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Nagasaki Peace Memorial Ceremony
Japan’s Prime Minister’s Office documents the Nagasaki Peace Memorial Ceremony on 9 August 2026, while Nagasaki’s official visitor information says the ceremony is held on 9 August every ye…
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Name Your PC Day
The first-party Wellcat Holidays calendar lists Name Your PC Day on November 20 and identifies Thomas and Ruth Roy as creators of the collection; technical device-naming sources are support…
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NASA Day of Remembrance
NASA describes its Day of Remembrance as an annual observance honoring members of the NASA family who lost their lives while furthering exploration; NASA scheduled the 2026 observance for J…
Source-backedVariable CustomIn-depth guide
NASCAR Day
Official NASCAR reporting documents NASCAR Day beginning in August 2004; later NASCAR Foundation campaigns and Giveathons have organizer-selected dates, not a reusable fixed date or governm…
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Natalicio de José Gervasio Artigas
Uruguay’s Ministry of Education and Culture commemorates José Gervasio Artigas’s birth on 19 June.
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National Acadian Day
Government of Canada / Canadian Heritage; celebrated since 1881 and recognized in federal law in 2003
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National Activity Professionals Day
California Association of Activity Professionals documents the history of National Activity Professionals Day, while current calendar references consistently use the fourth Friday in Januar…
Source-backedFixed AnnualIn-depth guide
National Adopt a Shelter Pet Day
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.
Source-backedRule Based AnnualIn-depth guide
National Advent Calendar Day
Contemporaneous reporting quoting Aldi says the company inaugurated National Advent Calendar Day in 2020 and set it annually on the first Wednesday of November.
Source-backedFixed AnnualIn-depth guide
National Adverse Drug Event Awareness Day
The American Society of Pharmacovigilance (ASP) announced on March 24, 2021 that it was establishing March 24 as National Adverse Drug Event Awareness Day. ASP later described 2024 as the t…
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National Africa Civility Day
National Day Archives records September 15 and credits World Civility Presidential Club with founding the observance in 2020; current awareness calendars retain September 15.
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National Airborne Day
A 2002 presidential proclamation designated August 16 as National Airborne Day in connection with the first official Army parachute jump on August 16, 1940. Senate resolutions have repeated…
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National Alabama Day
National Day Calendar lists National Alabama Day on 14 December as part of its creator-defined National State Days series, introduced in 2017 to honor states in the order they joined the Un…
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National Alaska Day
National Day Calendar lists National Alaska Day on 28 June as part of its creator-defined National State Days series, introduced in 2017 to honor states in the order they joined the Union.…
Source-backedRule Based AnnualIn-depth guide
National Alcohol Screening Day
NIH/NIAAA records the first National Alcohol Screening Day in 1999; state legislative recognition describes the recurring observance as the Thursday of the first full week in April.
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National Alligator Day
Wild Florida says it decided to create National Alligator Day in February 2021 and launched the observance on May 29, 2021 to encourage appreciation and education about alligators; Florida…
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National Amaretto Day
Two Association of Nutrition & Foodservice Professionals chapter calendars list National Amaretto Day on 19 April.
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National American Paddlefish Day
Shreveport Aquarium states that it obtained certification in 2019 for National American Paddlefish Day to be observed on March 9 each year.
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National American Sign Language Day
California’s disability-access commission and the American School for the Deaf corroborate recurring April 15 National ASL Day and the school’s April 15, 1817 opening; this is not an automa…
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National American Teddy Bear Day
Vermont Teddy Bear’s first-party site marks November 14 as National American Teddy Bear Day. A contemporaneous November 2002 University of Delaware Review report quoting Vermont Teddy Bear…
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National Animal Advocacy Day
The ASPCA explicitly promotes National Animal Advocacy Day on 30 April, and New York legislative resolutions provide additional civic recognition.
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National Animal Crackers Day
National Day Archives lists the canonical plural National Animal Crackers Day on April 18; the public singular title is retained as an alias.
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National Anthem and Flag Day
The Government of Aruba lists National Anthem and Flag Day on 18 March and describes March 18 as Aruba’s national holiday.
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National Apple Cider Vinegar Day
Bragg states that National Apple Cider Vinegar Day is celebrated on September 23 and identifies the observance as a Bragg-created campaign.
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National Apple Turnover Day
Two Association of Nutrition & Foodservice Professionals chapter calendars list National Apple Turnover Day on 5 July.
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National Arabian Horse Day
Arabian-horse industry and observance registry sources identify the Arabian Horse Association of Arizona as founder and February 19 as the annual observance date.
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National Archives Day (Philippines)
The National Archives of the Philippines states that Proclamation No. 660, s. 1995 declared October 21 of every year National Archives Day.
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National Arizona Day
National Day Calendar lists National Arizona Day on 21 June as part of its creator-defined National State Days series, introduced in 2017 to honor states in the order they joined the Union.…
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National Arkansas Day
National Day Calendar lists National Arkansas Day on 11 January as part of its creator-defined National State Days series, introduced in 2017 to honor states in the order they joined the Un…
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National Asian & Pacific Islander HIV/AIDS Awareness Day
HIV.gov states that National Asian & Pacific Islander HIV/AIDS Awareness Day is observed annually on May 19 and brings attention to HIV in Asian and Pacific Islander communities.
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National Astronaut Day
The White House issued a National Astronaut Day message on 5 May 2026 honoring Alan Shepard’s first American human spaceflight; the observance’s organizer describes May 5 as the annual date.
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National Automatic Door Day
AAADM announced the first National Automatic Door Day for March 19, 2021 and stated that it would be celebrated each year on that date; AAADM continues annual March 19 campaigns.
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National Aviation Day
36 U.S.C. §118 authorizes U.S. presidential proclamations designating August 19 as National Aviation Day; original recurring proclamation was issued in 1939, distinct from a one-time May 19…
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National B2B Salesperson Day
Salesperson Inc. states that it founded National B2B Salesperson Day in 2026 and designates January 16 every year for B2B salesperson recognition.
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National Bacon Burnt End Day
Emma Heim described applying for National Bacon Burnt End Day in 2019 and choosing June 29 because Heim Barbecue first served bacon burnt ends at its June 29, 2013 pop-up. Contemporary and…
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National Bacon Day
National Day Calendar attributes December 30 Bacon Day to Danya Goodman and Meff Leonard in 1997; Checkiday traces the same creator account to the former Bacon Day website, while CooksInfo…
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National Bakers-Crafters-Makers Day
National Day Archives records Gift Biz Unwrapped as creating the day in November 2020 for annual January 21 observance. Sue Monhait announced the January 21 celebration in January 2021, lat…