Reminds me of the other fake-but-now real holidays made up by tv shows and other groups. One example that comes to mind is Parks and Recreation making up "Galentines" day, and it's pretty much a real holiday by now.
Also reminds me of the quotes that Niles said to Frasier when Seattle named a day after him:
Niles: Happy Frasier Crane Day. Or is it Merry Frasier Crane Day,
I can never remember.
Frasier: Very amusing.
[...]
Frasier: Oh, up late last night?
Niles: Oh, I'm afraid so, as usual I left it till the last minute
to write all my Frasier Crane Day cards!
