For the third consecutive year Second City is hosting a holiday marathon to raise money for gifts for needy families whose Christmas wish lists, addressed to the north pole, have been obtained from the post office. A core group of current and former Second City folks--among them T.J. Jagodowski, Andy Cobb, main-stage director Mick Napier, Dan Bakkedahl, Pete Grosz, Sue Salvi, and MADtv's Keegan Michael-Key--has committed to staying onstage for 24 hours, performing improv games, monologues, long-form scenes, and anything else they can think of to stay awake. Past audiences have noted that sleep deprivation can bring out the best--or at least the craziest--in improvisers. The event also features guest artists from the worlds of comedy and music, including Steve Albini, Robbie Fulks, the Mekons' Jon Langford and Sally Timms, and Wilco's Jeff Tweedy. During Tweedy's set, a silent auction will be held for a private Tweedy concert in your own home. Tue 12/21, 8:30 PM, to Wed 12/22, 8:30 PM, Second City E.T.C., Piper's Alley, 1608 N. Wells, 312-337-3992 or 877-778-4707, $10 for the entire 24 hours.