The traditions are either Twelfth Night - January 6th or Candlemas Day Feb. 2nd. Or our local Hispanic tradition of keeping the lights up year round.
In the future as shown on Futurama the word Christmas has been completely lost in the mists of time, and replaced with the word "Xmas", pronounced Ecks-Mas. The day has lost all religious connotations it may or may not have had in the 21st century. As there are no more real firs, palm trees are used. Being nude on Xmas seems to be quite popular. As is not being on the streets that day because of the evil Santa Bot coming to town.
He knows when you are sleeping,
He knows when you're on the can,
He'll hunt you down and blast your ass from here to Pakistan.
You better not breathe, you better not move,
You're better off dead, I'm telling you, dude.
Santa Claus is gunning you down!