2019
First observance
Stephen Lawrence Day
De Montfort University contemporaneously described 22 April 2019 as the first national Stephen Lawrence Day.
Evergreen date guide
What is celebrated on April 22?
See the observances and verified observance-history milestones attached to April 22. 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.
2018
Institutional decision
Stephen Lawrence Day
The Foundation timeline dates the national-day announcement to 22 April 2018.
2009
First observance
International Mother Earth Day
UN General Assembly meeting coverage in 2010 states that International Mother Earth Day was first celebrated on 22 April 2009.
2009
Institutional decision
International Mother Earth Day
The UN Digital Library action note records adoption on 22 April 2009.
1996
Later action
National Sisters Day
Tennessee designated 2 August 1996 as Sisters’ Day and recognized the first annual observance, with a first-Friday-in-August recurrence described for later years.
1982
First observance
National Girl Scout Leader’s Day
A contemporaneous April 21, 1982 source explicitly describes April 22 as the first nationwide Girl Scout Leader’s Day.
1970
First observance
Earth Day
The reviewed evidence traces the modern Earth Day movement to the first Earth Day held in the United States on 22 April 1970.
Curated global anchors
See the collection →Major global guides on April 22
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
Earth Day
EARTHDAY.ORG’s current 2026 page identifies Earth Day 2026 as Wednesday, 22 April.
Source-backedFixed AnnualIn-depth guide
International Mother Earth Day
A/RES/63/278
Reviewed depth
Other in-depth guides on April 22
Source-backedFixed AnnualIn-depth guide
National Girl Scout Leader’s Day
Current Girl Scout council resources identify April 22 as Girl Scout Leader’s Day; contemporaneous April 1982 reporting identifies April 22, 1982 as the first nationwide observance and attr…
Source-backedFixed AnnualIn-depth guide
Stephen Lawrence Day
The Stephen Lawrence Day Foundation states that the day takes place every year on 22 April, the anniversary of Stephen Lawrence’s death, and its timeline records that Prime Minister Theresa…
Source-backedFixed AnnualIn-depth guide
“In God We Trust” coinage anniversary
U.S. Mint and Library of Congress history identify 22 April 1864 as the date Congress authorized the motto on the two-cent coin. That supports an anniversary anchor; it does not establish a…
Explore the mix
All topics →Topics represented on April 22
5 observances
All observances on this date
Source-backedFixed AnnualIn-depth guide
Earth Day
EARTHDAY.ORG’s current 2026 page identifies Earth Day 2026 as Wednesday, 22 April.
Source-backedFixed AnnualIn-depth guide
International Mother Earth Day
A/RES/63/278
Source-backedFixed AnnualIn-depth guide
National Girl Scout Leader’s Day
Current Girl Scout council resources identify April 22 as Girl Scout Leader’s Day; contemporaneous April 1982 reporting identifies April 22, 1982 as the first nationwide observance and attr…
Source-backedFixed AnnualIn-depth guide
Stephen Lawrence Day
The Stephen Lawrence Day Foundation states that the day takes place every year on 22 April, the anniversary of Stephen Lawrence’s death, and its timeline records that Prime Minister Theresa…
Source-backedFixed AnnualIn-depth guide
“In God We Trust” coinage anniversary
U.S. Mint and Library of Congress history identify 22 April 1864 as the date Congress authorized the motto on the two-cent coin. That supports an anniversary anchor; it does not establish a…
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 →