2026
First observance
International Day for Small Island Developing States
UNESCO’s official Day page explicitly refers to the 2026 commemoration as the first International Day for Small Island Developing States.
Evergreen date guide
What is celebrated on April 25?
See the observances and verified observance-history milestones attached to April 25. Each observance keeps its own source and date details.
Verified history
Today in history →On this date in observance history
Selected observance milestones connected to this date, based on reviewed sources.
2025
Later action
Republic Day
Designated Republic Day, July 1 each year, as Ghana’s National Day of Prayer and Thanksgiving.
2020
First observance
International Delegate's Day
United Nations in Belarus described the planned 25 April 2020 ceremony as the occasion of the first International Delegate’s Day.
2017
Later action
National Concert Day
Documented the 2017 edition for 1 May, again showing that the event did not follow a fixed May 5 recurrence.
2011
Institutional decision
20 August — celebration of the founding of the State / Saint Stephen’s Day
The National Legal Database dates the Fundamental Law to 25 April 2011; it became the successor constitutional framework from 2012.
2011
Institutional decision
23 October national holiday
The National Legal Database dates the Fundamental Law to 25 April 2011.
2008
First observance
World Malaria Day
WHO records identify 25 April 2008 as the first World Malaria Day after the 2007 World Health Assembly decision.
2003
First observance
National DNA Day
NHGRI’s historical page explicitly identifies 2003 as the first National DNA Day and describes nationwide activities on 25 April 2003.
Curated global anchors
See the collection →Major global guides on April 25
A reviewed starting point drawn from prominent global observances with strong institutional or organizer sources. Each observance keeps its own documented status and scope.
Source-backedFixed AnnualIn-depth guide
World Malaria Day
WHO observance
Reviewed depth
Other in-depth guides on April 25
Source-backedFixed AnnualIn-depth guide
Anzac Day
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…
Source-backedRule Based AnnualIn-depth guide
Bob Wills Day
The official Bob Wills Day organizer and Turkey, Texas material identify the annual event and its last-Saturday-in-April tradition.
Source-backedEdition SpecificIn-depth guide
DEA National Prescription Drug Take Back Day
DEA scheduled the 30th National Prescription Drug Take Back Day for Saturday, April 25, 2026 and explicitly describes Take Back Day as a twice-yearly event.
Source-backedFixed AnnualIn-depth guide
Freedom Day / 25 April
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…
Source-backedRule Based AnnualIn-depth guide
Independent Bookstore Day
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…
Source-backedFixed AnnualIn-depth guide
International Day for Small Island Developing States
Proclaimed by UNESCO in 2025
Explore the mix
All topics →Topics represented on April 25
19 observances
All observances on this date
Source-backedFixed AnnualIn-depth guide
Anzac Day
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…
Source-backedRule Based AnnualIn-depth guide
Bob Wills Day
The official Bob Wills Day organizer and Turkey, Texas material identify the annual event and its last-Saturday-in-April tradition.
Source-backedEdition SpecificIn-depth guide
DEA National Prescription Drug Take Back Day
DEA scheduled the 30th National Prescription Drug Take Back Day for Saturday, April 25, 2026 and explicitly describes Take Back Day as a twice-yearly event.
Source-backedFixed AnnualIn-depth guide
Freedom Day / 25 April
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…
Source-backedRule Based AnnualIn-depth guide
Independent Bookstore Day
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…
Source-backedFixed AnnualIn-depth guide
International Day for Small Island Developing States
Proclaimed by UNESCO in 2025
Source-backedFixed AnnualIn-depth guide
International Delegate's Day
A/RES/73/286
Source-backedRule Based AnnualIn-depth guide
International Sculpture Day
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.
Source-backedFixed AnnualIn-depth guide
National DNA Day
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.
Source-backedRule Based AnnualIn-depth guide
National First Ladies Day
The National First Ladies Day Commission says the observance was founded in 2021 and schedules its annual celebration on the last Saturday in April.
Source-backedRule Based AnnualIn-depth guide
National Pool Opening Day
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…
Source-backedRule Based AnnualIn-depth guide
National Rebuilding Day
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.
Source-backedFixed AnnualIn-depth guide
Parental Alienation Awareness Day
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.
Source-backedFixed AnnualIn-depth guide
Red Hat Society Day
Red Hat Society first-party material identifies 25 April as its official birthday and the anniversary of the first gathering on 25 April 1998.
Source-backedFixed AnnualIn-depth guide
Sinai Liberation Day
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.
Source-backedFixed AnnualIn-depth guide
World Malaria Day
WHO observance
Source-backedFixed AnnualIn-depth guide
World Penguin Day
Penguins International’s World Penguin Day page identifies 25 April as the observance date and frames it around penguin awareness and conservation.
Source-backedRule Based AnnualIn-depth guide
World Tai Chi & Qigong Day
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…
Source-backedRule Based AnnualIn-depth guide
World Veterinary Day
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…
How dates are selected
This page combines fixed annual dates, reusable calendar rules and year-specific dates confirmed for 2026. Variable or historical dates are included only when they are clearly supported.
Read the methodology →