2020
Later action
International Day of Reflection on the 1994 Genocide against the Tutsi in Rwanda
Reaffirmed 7 April under the current title and strengthened the resolution language concerning remembrance, prevention, denial and education.
Evergreen date guide
What is celebrated on April 21?
See the observances and verified observance-history milestones attached to April 21. 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.
2016
First observance
National Tea Day
The organizer’s archive includes National Tea Day 2016 and the official site fixes April 21.
2002
First observance
World Creativity and Innovation Day
A/RES/71/284 states that World Creativity and Innovation Day was first commemorated on 21 April 2002 and was already observed by citizens and organizations in more than 50 countri…
Curated global anchors
See the collection →Major global guides on April 21
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 Creativity and Innovation Day
A/RES/71/284
Reviewed depth
Other in-depth guides on April 21
Source-backedFixed AnnualIn-depth guide
National Bulldogs Are Beautiful Day
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…
Source-backedRule Based AnnualIn-depth guide
National Bunion Day
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…
Source-backedFixed AnnualIn-depth guide
National Pet CBD Day
Innovet announced National Pet CBD Day for April 21 in 2019; archival observance material continues to identify April 21 and Innovet as the creator.
Source-backedFixed AnnualIn-depth guide
National Tea Day
The National Tea Day organizer site publishes the observance on 21 April and lists the 2026 National Tea Day edition for 21 April 2026.
Source-backedFixed AnnualIn-depth guide
San Jacinto Day
Texas legislative records establish the 1836 historical anchor, the 1874 state-holiday action and current Government Code §662.003(b).
Source-backedFixed AnnualIn-depth guide
Tiradentes Day
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…
Explore the mix
All topics →Topics represented on April 21
8 observances
All observances on this date
Source-backedFixed AnnualIn-depth guide
National Bulldogs Are Beautiful Day
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…
Source-backedRule Based AnnualIn-depth guide
National Bunion Day
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…
Source-backedFixed AnnualIn-depth guide
National Pet CBD Day
Innovet announced National Pet CBD Day for April 21 in 2019; archival observance material continues to identify April 21 and Innovet as the creator.
Source-backedFixed AnnualIn-depth guide
National Tea Day
The National Tea Day organizer site publishes the observance on 21 April and lists the 2026 National Tea Day edition for 21 April 2026.
Source-backedFixed AnnualIn-depth guide
San Jacinto Day
Texas legislative records establish the 1836 historical anchor, the 1874 state-holiday action and current Government Code §662.003(b).
Source-backedFixed AnnualIn-depth guide
Tiradentes Day
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…
Source-backedFixed AnnualIn-depth guide
World Creativity and Innovation Day
A/RES/71/284
Source-backedFixed AnnualIn-depth guide
World Curlew Day
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…
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 →