Looking for something to do next Tuesday, for oh, say, twenty-four hours? The Second City is presenting its third annual benefit performance, "The Second City That Never Sleeps: Letters To Santa." Beginning at 8:30 Tuesday night, a group of Second City all-stars takes the stage—and doesn't leave it until 8:30 the next night. Proceeds go to gifts for needy Chicago-area kids. (If improv isn't your bag, you might be enticed by the prospect of Jeff Tweedy in your living room. The Wilco frontman does a guest spot during the evening, and there'll be a silent auction to win a private performance for you and twenty of your friends.) Further details in Slowdown.