There are other ways it celebrates like the main page (which you should check out), but I think you’re less likely to know about the deletion discussions.
NOTE: This is separate from formally nominating an article for deletion. If you wish to participate, do not actually follow the article nomination procedure. Also, Wikipedia operates on Coordinated Universal Time (UTC).
Why YSK: Wikipedia often presents as self-serious, but in reality, the only thing keeping the project from turning into a giant shitpost is collective self-discipline. You might find it funny to see how Wikipedians really act and maybe get involved in the festivities even if you don’t normally work on the project.
Tried in 2021, but the corrupt admin cabal only deleted the observable Universe, undermining the community’s wishes. Their pro-Universe influence has gotten so bad in five years that, in 2026, there’s a discussion trying to get rid of the heat death of the Universe.