6 observances land on 21 September. We have not found a recorded founder for any of them.
| Observance | Declared by | First year | Source |
|---|---|---|---|
| Earth, Wind and Fire Day United StatesTwo accounts. Maurice White said he picked the 21st for how it sang. His wife told the Wall Street Journal in 2019 it was their son's due date. | no record | — | Checkiday |
| Arbor Day Brazil | no record | — | — |
| Customs Service Day Poland | no record | — | — |
| Founder's Day and National Volunteer Day Ghana | no record | — | — |
| International Day of Peace International | no record | — | — |
| Student's Day Bolivia | 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.
1 year named so far. The next one is Tuesday, 21 September 2027.
Tuesday, 21 September 2027 has no name yet. It costs $2.