yes, only this past one. they called it Jingle's Jamboree, and there were i think 8 or 9 different contests you could enter to earn snowflakes. then the snowflakes could be redeemed in the forum shop for boxed gifts. on Christmas day the boxed gifts opened to reveal all of the mittens and ACNL dolls you see in some users' line-ups. some of the threads may be archived at the Bulletin Board forum.
i think before last year, they held "Bell Tree Fair" over the Christmas holidays (where people obtained the patches, feather, and balloon collectibles). they said they may do the Fair this summer instead.