Arts Entertainment Lifestyle observances

International Day of Human Space Flight

12 April · United Nations / international observance

A/RES/65/271

International Day of Islamic Art

18 November · UNESCO international day

Proclaimed at UNESCO’s 40th General Conference (2019)

International Day of Light

16 May · UNESCO international observance

UNESCO 39 C/Resolution 16

International Day of Mathematics

14 March · UNESCO international observance

International Day of the Celebration of the Solstice

21 June · United Nations / international observance

A/RES/73/300

International Day of the Intangible Cultural Heritage

17 October · UNESCO international day

Proclaimed at UNESCO’s 42nd General Conference (2023)

International Day of University Sport

20 September · UNESCO international day

International Day of Yoga

21 June · United Nations international observance

A/RES/69/131

International Design Day

27 April · 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…

International Documentary Day

16 April · 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.

International Edible Book Festival / Edible Book Day

1 April · 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.

International Francophonie Day

20 March · International Francophonie / French-language and cultural observance

UNESCO and the Organisation internationale de la Francophonie identify March 20 as International Francophonie Day. The date commemorates the creation of the Agency for Cultural and Technica…

International Geocaching Day

Third Saturday of August · Global geocaching community observance coordinated by Geocaching HQ; outdoor recreation with land-permission, property, privacy, environmental and safety boundaries

Geocaching HQ first-party history identifies August 20, 2011 as the first International Geocaching Day and states that it is now celebrated every third Saturday in August. Current official…

International Jazz Day

30 April · UNESCO / international observance

UNESCO 36 C/Resolution 39

International Louie Louie Day

11 April in the organizer/community tradition; current activity should be rechecked yearly · 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…

International Marconi Day

Saturday closest to 25 April · International amateur-radio operating event administered by the Cornish Radio Amateur Club; commemorates Guglielmo Marconi while preserving wider wireless-telegraphy history and licensing/safety boundaries

Cornish Radio Amateur Club first-party material verifies its current administration of International Marconi Day, a 24-hour annual amateur-radio event usually held on the Saturday closest t…

International Moon Day

20 July · United Nations / international observance

A/RES/76/76

International Music Day

1 October · Organizer-backed international cultural observance

International Music Council (IMC)

International Pageant Day

8 April · 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…

International Podcast Day™

30 September annually · 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 Read to Me! Day

19 March · International Read to Me! Day / literacy campaign

The campaign’s official site identifies International Read to Me! Day as 19 March and describes the date as a focal day within a broader ongoing reading effort.

International Sculpture Day

Last Saturday of April · 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.

International Skinny Dip Day

Second Saturday in July; 11 July 2026 · AANR / naturist recreation observance

The American Association for Nude Recreation states that International Skinny Dip Day is held on the second Saturday of July and identifies 11 July as the 2026 date.

International Strange Music Day

24 August · International / creator-led music observance

Creator Patrick Grant’s own site identifies International Strange Music Day as August 24 and continues to publish annual observance entries, including the 28th annual event in 2026.

International Sudoku Day

9 September annually · 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…

International Surfing Day

Third Saturday of June · Global surfing, beach-access and coastal-protection observance / Surfrider Foundation

Surfrider Foundation states that International Surfing Day began in 2005; its history records Surfrider Foundation and Surfing Magazine declaring June 20 International Surfing Day, while cu…

International Talk Like a Pirate Day

19 September · 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.

International Talk Like William Shatner Day

22 March; under the creator’s original convention, weekend occurrences move to the following Monday · Creator-originated parody/pop-culture observance founded by voice actor Maurice LaMarche

Maurice LaMarche’s first-party 2009 declaration created International Talk Like William Shatner Day for March 22 and specified a following-Monday rule when March 22 falls on a weekend; his…

International Top Spinning Day

Second Wednesday in October; 14 October in 2026 · International toy/craft museum observance

The Spinning Top & Yo-Yo Museum identifies International Top Spinning Day on the second Wednesday in October and lists the 2026 date.

International Town Criers Day

Second Monday of July; continuation reviewed annually by the guild board · Ontario Guild of Town Criers / town-crier community

The Ontario Guild of Town Criers says International Town Criers Day began in 1997, was founded by Scott Fraser and is designated for the second Monday of July, with continuation reviewed an…

International Vlogging Day

10 August · International online-video creator community / Summer in the City-origin observance

Contemporary creator-industry coverage records Summer in the City founders Tom Burns and David Bullas announcing the first International Vlogging Day for 10 August 2018 and presenting it as…

International Winter Bike to Work Day

Second Friday in February; 13 February 2026 · International Winter Bike to Work Day organizer / participant-led campaign

The official campaign site states that International Winter Bike to Work Day began in 2013 and occurs on the second Friday in February every year.

June Public Holiday (Ireland)

First Monday in June · Irish public holiday

Workplace Relations Commission / Irish Statute Book

Kids Music Day

First Friday in October; 2 October in 2026 · Keep Music Alive / international music-education participation campaign

Keep Music Alive states that Kids Music Day is celebrated each year on the first Friday in October and lists the 11th annual event on 2 October 2026.

La Tomatina

last Wednesday of August; 26 August in 2026 · Buñol municipal festival, Spain

Ajuntament de Buñol / municipal tourism authority

Lantern Festival (元宵节 / Yuanxiao Festival)

3 March 2026; traditionally the 15th day of the first lunar month · China / traditional festival, with Beijing government 2026 date evidence

Beijing municipal cultural authorities: fifteenth day of first lunar month; March 3 only for 2026

Launceston Cup regional holiday

25 February 2026; last Wednesday in February · Parts of northern Tasmania, Australia

WorkSafe Tasmania and Southern Midlands Council regional public-service holiday schedules; boundaries and partial-day start vary

Lei Day

1 May · Hawaiʻi cultural observance recognized by the state

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

Library Lovers’ Day

14 February each year · Australian Library and Information Association / library-sector campaign

ALIA verifies February 14 annually, inception in 2006 by the State Library of New South Wales and current ALIA promotion/support with local library adaptation.

Library Shelfie Day

Fourth Wednesday of January; 28 January in 2026 · Libraries and readers / social book-and-library tradition

The New York Public Library says Library Shelfie Day occurs every year on the fourth Wednesday of January and that the tradition started in 2014.

Love Your Bookshop Day

10 October in 2026 · Australia / Australian Booksellers Association campaign

The Australian Booksellers Association’s 2026 campaign pages set Love Your Bookshop Day for Saturday 10 October 2026.

Lui-Ngai-Ni

15 February · Manipur, India / Naga seed-sowing festival

The Government of Manipur Department of Tribal Affairs and Hills says Lui-Ngai-Ni is observed on 15 February every year and describes it as a collective Naga seed-sowing festival.

Macintosh launch anniversary

24 January · Technology-history anniversary / original Macintosh release

The Computer History Museum records that Apple released the Macintosh on 24 January 1984.

Major League Baseball Opening Day

Traditional Opening Day: 26 March 2026; special Opening Night: 25 March 2026 · Major League Baseball / 2026 regular season

MLB’s master schedule distinguishes a special Opening Night on March 25 from traditional Opening Day on March 26, 2026.

MAR10 Day / Mario Day

10 March each year · Nintendo / Mario fan celebration

Nintendo official material verifies March 10 as MAR10 Day / Mario Day and the MAR 10 → MARIO visual wordplay; original creator, formal adoption year and first recurring edition remain unass…

Math 2.0 Day

8 July · International informal mathematics-and-technology/community anniversary observance

Maria Droujkova’s MathFuture archive states on July 8, 2010 that the Math 2.0 group and weekly meeting began exactly one year earlier on July 8, 2009. Contemporary 2009 community records co…

Math Storytelling Day

25 September · 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.

Mid-Autumn Festival

25–27 September 2026 public-holiday period · 15th of eighth Chinese lunar month; mainland China 2026 festival Sept 25 and statutory break Sept 25–27; other regions differ

The General Office of China’s State Council sets the 2026 Mid-Autumn Festival public-holiday period at 25–27 September.

Mole Day

23 October, traditionally 6:02 a.m. to 6:02 p.m. · International chemistry-education observance led by the National Mole Day Foundation

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…

Museum Selfie Day

Third Wednesday of January (21 January in 2026) · International / museum-participation campaign created by Mar Dixon

Museum and government cultural sources identify Museum Selfie Day as a Mar Dixon-created annual campaign on the third Wednesday of January.

Music Festival Stars of the White Nights

29 May–24 July 2026 · St. Petersburg, Russia / annual Mariinsky Theatre Music Festival Stars of the White Nights; target-year schedule is edition-specific

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…

Mărțișor

1 March · Bulgaria, North Macedonia, Republic of Moldova and Romania / UNESCO-listed first-of-March cultural practices

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…

NASCAR Day

Organizer-scheduled; historical editions include 17 May 2013 and 17 May 2019 · United States / NASCAR Foundation charitable initiative

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…

National American Teddy Bear Day

14 November · United States / informal teddy-bear appreciation observance

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…

National Archives Day (Philippines)

21 October · Philippines / national archives and records observance

The National Archives of the Philippines states that Proclamation No. 660, s. 1995 declared October 21 of every year National Archives Day.

National Barbershop Quartet Day

11 April · 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.

National Barcode Day

26 June annually · AIDC / supply-chain industry observance founded by Barcoding, Inc., Datalogic and ScanSource

Barcoding, Inc. says it created National Barcode Day with Datalogic and ScanSource for June 26, commemorating the first retail UPC scan on June 26, 1974.

National Bath Bomb Day

25 May · United States / Desert Bath Company-created bath-product observance

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

National Black Poetry Day

17 October · United States / cultural-literary commemoration honoring Black poetry and Jupiter Hammon

New York legislative and SUNY Plattsburgh records trace Black Poetry Day to Stanley Ransom in 1970, observed on October 17 for Jupiter Hammon’s birthday; later state resolutions recognize t…

National Bowling Day

Latest dated organizer page: Saturday 9 August 2025; 2026 industry materials confirm campaign continuity but not a 2026 date · United States / Go Bowling and bowling-industry National Bowling Day campaign; target-year date remains edition-specific

Go Bowling’s official campaign page documents Saturday, 9 August for the 2025 edition and says the sport has been featured on FOX & Friends for National Bowling Day each year since 2018. US…

National Canoe Day

26 June annually · Canadian canoe heritage and paddling community

The Canadian Canoe Museum identifies 26 June as National Canoe Day and maintains a current 2026 event page.

National Cartonnage Day

Third Saturday in September · 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 Chess Day

Second Saturday in October; 10 October in 2026 · US Chess / United States chess community

US Chess identifies National Chess Day on the second Saturday in October and traces it to a 1976 Ford-era cultural acknowledgment resulting from Bill Dodgen’s efforts; its Ford Library rese…

National Color Day

22 October · United States / informal color observance recognized by Crayola

Crayola first-party materials identify October 22 as National Color Day.

National Coloring Book Day

2 August · Coloring community / Dover Publications-created annual observance

Dover Publications states that it launched National Coloring Book Day, identifies August 2 as the annual date, and marks 2025 as the tenth anniversary; its 2016 release calls that year the…

National Concert Day

Organizer/edition-defined; documented dates include 5 May 2015, 3 May 2016 and 1 May 2017 · United States / Live Nation concert-season campaign

Live Nation created National Concert Day for May 5, 2015 and documented later editions on May 3, 2016 and May 1, 2017. The event therefore remains variable-custom and requires current organ…

National Craft Distillery Day

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

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

National Craft for Your Local Shelters Day

21 July · United States / animal-shelter craft-support campaign

Founder Erika Lindquist’s Sew Doggy Style archive says the official date is July 21 and that the observance started in 2012; NAPPS independently attributes the day to Lindquist.

National Craft Jerky Day

27 November · United States / Long Beach Jerky Co.-created informal craft-food observance

National Day Calendar identifies Long Beach Jerky Co. as founder, states that November 27 honors “Gramps” Albert’s birthday, and records private registrar approval in 2016; the approval is…

National Crayon Day

31 March · Creative arts / Crayola first-party recognition

Crayola’s current craft resources identify March 31 as National Crayon Day and provide dedicated activities for the observance.

National Crime Junkie Day

18 December · United States / Crime Junkie-created informal fan-community anniversary observance with victim-advocacy framing.

Crime Junkie’s first-party fifth-anniversary page established National Crime Junkie Day for December 18, 2022 and ties the date to the podcast’s December 18, 2017 debut; a creator-linked cu…

National Croc Day

23 October · Crocs brand and fan community / Croctober fan-originated footwear observance

Crocs corporate history traces Croc Day to fan activity on October 23, 2017 and repeatedly identifies October 23 as the annual Croc Day date, including in 2025. The inherited October 25 val…