Guild Wars: Wintersday
is December 19th through January 2nd
The humans of Tyria celebrate the ending of one year and beginning of another. During this time the deities of Tyria battle over whether Spring will come early or winter run late. There are a series of WIntersday quests in Guild Wars: Prophecies, Nightfall and Eye of the North. Guild Wars: Factions has its own holidays. Unfortuantlky Wintersday is no longer updated with new festval masks because Arenanet has most of its people supporting Guild Wars 2, instead you can get masks from past years. I'm almost caught up.Guild Wars 2: Wintersday
begins December 16th.
Originally a human holiday, Wintersday is now celebrated by other races for different reasons (now that there are other playable races than just human).Star Wars: The Old Republic's Life Day
Begins December 16th (after update 3.0.1 which will fix bugs in Shadow of Revan, and implement 3rd Anniversary Vendors on the fleet). I''ll update the link if a new entry is posted later. A wookie holiday adopted by other races as an excuse to party.