2023
Institutional decision
World Sustainable Transport Day
The UN Digital Library records the resolution as adopted without a vote on 16 May 2023.
Evergreen date guide
What is celebrated on May 16?
See the observances and verified observance-history milestones attached to May 16. 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
First observance
International Day of Light
UNESCO’s 2017 proclamation announcement scheduled the first International Day of Light celebration for 16 May 2018, and UNESCO’s 17 May 2018 report describes that celebration as t…
2018
First observance
International Day of Living Together in Peace
The General Assembly spokesperson explicitly stated that 16 May 2018 was the first observance since the Day was declared.
2013
Institutional decision
Randol Fawkes Labour Day
The Act records assent on 16 May 2013 and commencement on 17 May 2013.
1957
Institutional decision
National Defense Transportation Day
The U.S. Code historical note identifies the original enactment date.
Curated global anchors
See the collection →Major global guides on May 16
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
International Day of Light
UNESCO 39 C/Resolution 16
Reviewed depth
Other in-depth guides on May 16
Source-backedFixed AnnualIn-depth guide
International Day of Living Together in Peace
A/RES/72/130
Source-backedFixed AnnualIn-depth guide
National Do Something Good for Your Neighbor Day
City of Huntsville and City of Milford proclamations credit Starr Valentino with starting the grassroots movement in Atlanta in 2009 and recognize May 16 locally; National Day Calendar says…
Source-backedFixed AnnualIn-depth guide
National Honor Our LGBT Elders Day
SAGE/National Resource Center materials identify May 16 as National Honor Our LGBT Elders Day; congressional resolutions have also recognized the observance.
Source-backedRule Based AnnualIn-depth guide
National Learn to Swim Day™
Creator-issued Swimways releases state that Swimways founded National Learn to Swim Day™ in 2012 on the third Saturday of May each year; a 2019 Swimways release documents expansion of the p…
Source-backedRule Based AnnualIn-depth guide
World Fiddle Day
World Fiddle Day campaign; recurrence and history corroborated in Canada’s National Fiddling Day Act
Explore the mix
All topics →Topics represented on May 16
6 observances
All observances on this date
Source-backedFixed AnnualIn-depth guide
International Day of Light
UNESCO 39 C/Resolution 16
Source-backedFixed AnnualIn-depth guide
International Day of Living Together in Peace
A/RES/72/130
Source-backedFixed AnnualIn-depth guide
National Do Something Good for Your Neighbor Day
City of Huntsville and City of Milford proclamations credit Starr Valentino with starting the grassroots movement in Atlanta in 2009 and recognize May 16 locally; National Day Calendar says…
Source-backedFixed AnnualIn-depth guide
National Honor Our LGBT Elders Day
SAGE/National Resource Center materials identify May 16 as National Honor Our LGBT Elders Day; congressional resolutions have also recognized the observance.
Source-backedRule Based AnnualIn-depth guide
National Learn to Swim Day™
Creator-issued Swimways releases state that Swimways founded National Learn to Swim Day™ in 2012 on the third Saturday of May each year; a 2019 Swimways release documents expansion of the p…
Source-backedRule Based AnnualIn-depth guide
World Fiddle Day
World Fiddle Day campaign; recurrence and history corroborated in Canada’s National Fiddling Day Act
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 →