As Dilpyckle posted, there was another suggestion in the past to make the avatars go live earlier, but, as you can tell by the thread icon, the suggestion was neither approved nor denied. However, at the moment, it's not a "glitch" that it isn't out yet. It has always been set to the 20th in previous years. If the developers change it so the avatars are put up earlier, we'll let you know.
Michael, you're completely right but at this time there isn't anything that can be done (unless the suggestion is approved and the feature is developed within the next few days but I doubt that will happen). Hopefully the suggestion will be approved and implemented by next year. BTW Happy Hannukah!
"there was another suggestion in the past to make the avatars go live earlier, but, as you can tell by the thread icon, the suggestion was neither approved nor denied"
December 1 to January 7 may be a better timeframe for the holiday avatars, since Hanukkah is gonna start even earlier next year on December 2 and people tend to start getting into the holiday spirit around the start of Advent (Dec. 2 next year and Dec. 1 in 2019). It's kinda late this year to implement this year but I think it'd be a good idea for next year and beyond.