One observance lands on 29 September. We have not found a recorded founder for any of them.
| Observance | Declared by | First year | Source |
|---|---|---|---|
| Inventors' Day ArgentinaWikipedia says it falls on the birthday of László Bíró, born 29 September 1899, who patented the first commercially successful modern ballpoint pen | no record | 1986 | Wikipedia |
"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 29 September here. The next one is Wednesday, 29 September 2027.
Wednesday, 29 September 2027 has no name yet. It costs $2.