Hailed by the New York Times as "perfect masters of improvisation," Chicago City Limits relies on the audience for inspiration in America Idles, a new show poking fun at our fame-obsessed culture. Thursday, Jan. 20, and Friday, Jan. 21, at 8 p.m. The Barns at Wolf Trap, 1645 Trap Road, Vienna. Tickets are $24. Call 703-255-1900 or visit wolf-trap.org.