Some people like to put on the dog, others like to kick back.
Either way, posturing in Armani or prostrate in Land's End, you're covered. Theakston's Old Peculier, a festive London ale. Chase each one with a tall glass of water. The H2O will help you maintain an easy pace, keep you sharp through the night and not regretting the next thousand years on Jan. 1. A tuxedo if you're really high-ending it with a vest, not cummerbund.