Last year Chris, Jess, and I did a somewhat informal crawl from Haymarket, to Goose Island, to Revolution for some seasonal local beers. We were expecting the day before Christmas Eve to be like the Wednesday before Thanksgiving (shoulder-to-shoulder, standing-room-only crowded) but instead it was a drinker's paradise. Nary a soul to be found. We're hoping it's the same again this year!
This year, same route: HayMarket; north on Halsted to Goose Island; west on North to Piece (optional stop); north-west on Milwaukee to Revolution. If people are still standing thereafter, we can decide on one more spot (Owen & Engine is not too far).
UPDATE (12/21/2012): My best friend is in from out of town and it looks like the only night that works for a bunch of our friends the 23rd. I, the organizer, will probably not be able to attend! That's not reason enough to cancel it, though! Carry on with the Christmas Crawl tradition!