W.S.
This isn't exactly what you are describing, but for a really fun experience, I can highly recommend Pocket Sandwich Theatre. This will be the third New Years Eve in a row that my husband and I have spent at PST. It is a VERY casual dinner theatre. On New Years they have a dinner buffet; beer, wine, or soda; a very funny - usually silly popcorn tossing melodrama where you - the audience - gets to throw popcorn at the actors and your friends and neighbors; then after the show some light hearted comedy routine will take you into the New Year. Also included is a champagne toast, and funny hats and noise makers. Everything is included.
Check out their website: http://www.pocketsandwich.com
If the popcorn tossing melodramas seem just a little too silly for your liking, check back with them in 2009 - they have regular comedies (without popcorn) throughout the year. They use a lot of local writers, and my husband and I have never been to a show that we didn't enjoy.