11 observances land on 21 March. We have not found a recorded founder for any of them.
| Observance | Declared by | First year | Source |
|---|---|---|---|
| Arbor Day Lesotho | no record | — | — |
| Arbor Day Portugal | no record | — | — |
| Early music | no record | — | — |
| Education Freedom Day | no record | — | — |
| Harmony Day Australia | no record | — | — |
| Human Rights Day South Africa | no record | — | — |
| International Colour Day International | no record | — | — |
| International Day of Forests International | no record | — | — |
| Mother's Day most of the Arab world | no record | — | — |
| Oltenia Day Romania | no record | — | — |
| Rosie the Riveter Day United States | no record | — | — |
"No record" means we could not find one, not that none exists. Where a founder is named, the source is named with it.
Who decides these? Nobody official. A brand, a trade body, a government, or one person with a website. Most are simply asserted and then repeated until they look official. Here, whoever names it first.
Nobody has ever named 21 March here. The next one is Sunday, 21 March 2027.
Sunday, 21 March 2027 has no name yet. It costs $2.