3 observances land on 23 December. We have not found a recorded founder for 2 of them.
| Observance | Declared by | First year | Source |
|---|---|---|---|
| Festivus United StatesWikipedia says his son, writer Dan O'Keefe, brought it to the TV show Seinfeld | author Daniel O'Keefe | 1966 | Wikipedia |
| National Roots Day United States | no record | — | National Day Calendar |
| National Pfeffernusse Day United States | no record | — | National Day Calendar |
"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 23 December here. The next one is Wednesday, 23 December 2026.
Wednesday, 23 December 2026 has no name yet. It costs $2.