3 observances land on 13 September. We have not found a recorded founder for any of them.
| Observance | Declared by | First year | Source |
|---|---|---|---|
| Día de los Niños Héroes Mexico | no record | — | — |
| Engineer's Day Mauritius | no record | — | — |
| Roald Dahl Day Africa, United Kingdom, Latin America | 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 13 September here. The next one is Monday, 13 September 2027.
Monday, 13 September 2027 has no name yet. It costs $2.