Photo by Mike Maguire.

SLUMBER: “DC’s best comedians are throwing a slumber party!” Expect more laughs than slumbering. PJs welcome! Cobalt (1639 R Street NW) 8-10 p.m. $7

ROCK: Free to Rock, a documentary film narrated by Kiefer Sutherland, features “Presidents, diplomats, spies, and rock stars from the West and the Soviet Union who reveal how rock and roll music was a contributing factor in ending the Cold War.” A panel discussion will follow the screening. Georgetown University’s Gaston Hall (37th and O Streets NW) 7:30 p.m. Free

IMPROV: Pay what you choose at Washington Improv Theater’s weekly Harold Night. After watching five talented teams, you can try your hand at improv in the free jam that ends the event. SOURCE (1835 14th Street NW) Two sessions at 8 and 9 p.m. PWYC