2 observances land on 4 December. We have not found a recorded founder for any of them.
| Observance | Declared by | First year | Source |
|---|---|---|---|
| Thai Environment Day Thailand | no record | — | — |
| Tupou I Day Tonga | 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 4 December here. The next one is Friday, 4 December 2026.
Friday, 4 December 2026 has no name yet. It costs $2.