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Observance library

Browse all researched observances

2,411 researched observances. Search for a specific name or known alternate name.

Source-backedRule Based AnnualIn-depth guide

International Coastal Cleanup®

Third Saturday of September annually; 19 September in 2026 · 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.

Source-backedFixed AnnualIn-depth guide

International Coffee Day

1 October · United Nations / international observance

A/RES/80/248

Source-backedFixed AnnualIn-depth guide

International Colour Day

21 March · international colour awareness and interdisciplinary observance

International Colour Association (AIC)

Source-backedFixed AnnualIn-depth guide

International Condom Day

13 February annually; 13 February 2026 verified · International / AIDS Healthcare Foundation safer-sex campaign

AIDS Healthcare Foundation states it launched International Condom Day in 2009 and celebrates it on February 13; its 2026 campaign confirms that date.

Source-backedFixed AnnualIn-depth guide

International Conscientious Objection Day

15 May · International / conscientious-objection awareness and historical observance

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

Source-backedFixed AnnualIn-depth guide

International Country Music Day

17 September · 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…

Source-backedFixed AnnualIn-depth guide

International Cribbage Day

10 February in American Cribbage Congress history; confirm current organizer programming yearly · American Cribbage Congress and international cribbage-community observance

American Cribbage Congress board minutes describe the second annual International Cribbage Day held on February 10 and note collaboration with cribbage organizations outside the United Stat…

Source-backedFixed AnnualIn-depth guide

International Customs Day

26 January · international customs-service recognition and public-awareness observance

World Customs Organization (WCO) states that International Customs Day is celebrated every 26 January to mark the Customs Co-operation Council’s inaugural session on 26 January 1953.

Source-backedFixed AnnualIn-depth guide

International Dance Day

29 April · 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.

Source-backedFixed AnnualIn-depth guide

International Dark ‘n Stormy® Day

9 June annually · Goslings brand / trademarked cocktail observance

Goslings says it declared June 9 International Dark ‘n Stormy® Day. This v81 overlay also repairs the legacy normalized-key mismatch caused by the ® symbol so the live page can reach the so…

Source-backedFixed AnnualIn-depth guide

International Darwin Day

12 February · Organizer-led international science and education observance

The Darwin Day organization identifies 12 February as International Darwin Day and maintains current event listings; no UN designation is asserted here.

Source-backedRule Based AnnualIn-depth guide

International Dawn Chorus Day

First Sunday in May; 3 May in 2026 · The Wildlife Trusts / international nature-listening participation

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

Source-backedFixed AnnualIn-depth guide

International Day against Homophobia, Transphobia and Biphobia (IDAHOBIT)

17 May annually · Global decentralized equality and human-rights observance

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

Source-backedFixed AnnualIn-depth guide

International Day Against Police Brutality

15 March · International activist/civil-society observance originating in Montreal

The Collective Opposed to Police Brutality (COBP) documents March 15 as the International Day Against Police Brutality since 1997, with independent historical corroboration.

Source-backedFixed AnnualIn-depth guide

International Day against the Use of Child Soldiers

12 February · United Nations children-and-armed-conflict context

The UN Office of the Special Representative for Children and Armed Conflict states that the Optional Protocol entered into force on 12 February 2002 and that the date is now known as the In…

Source-backedFixed AnnualIn-depth guide

International Day for Monuments and Sites

18 April · ICOMOS international heritage observance; concept adopted by UNESCO in 1983

International Council on Monuments and Sites (ICOMOS)

Source-backedFixed AnnualIn-depth guide

International Day for Street Children

12 April each year · 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.

Source-backedFixed AnnualIn-depth guide

International Day of Acceptance

20 January annually · International / 3E Love disability-acceptance campaign

3E Love identifies January 20 as the International Day of Acceptance and maintains the observance’s first-party campaign materials. The reviewed first-party pages establish current stewards…

Source-backedFixed AnnualIn-depth guide

International Day of Action for Rivers

14 March · international river-protection and community-rights action observance

International Rivers states that participants at the first International Meeting of People Affected by Dams in Curitiba, Brazil, adopted the International Day of Action Against Dams and For…

Source-backedFixed AnnualIn-depth guide

International Day of Action for Women’s Health

28 May annually; 2026 campaign on 28 May · international women’s health and health-rights campaign

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

Source-backedFixed AnnualIn-depth guide

International Day of Awesomeness

10 March · International / informal creator-led celebration maintained by the observance’s first-party site

The official International Day of Awesomeness site identifies Kevin Lawver as the creator, traces the idea to August 6, 2007, says the observance occurs every March 10, explains that the da…

Source-backedFixed AnnualIn-depth guide

International Day of Banks

4 December · United Nations / international observance

A/RES/74/245