Photo by Chris.

BIKES: It’s the last DC Bike Party until April. Bring your holiday lights, Santa suits, and jingle bells. Dupont Circle Fountain (1900 P Street NW) 7:30 p.m. Free.

INTERROGATION: A discussion led by Marc Rotenberg, executive director of the Electronic Privacy Information Center, will follow a performance of the dark comedy Interrogation. Busboys and Poets (1025 5th Street NW) 8-10 p.m. $15 suggestion donation at the door.

FASHION: It’s time to bring out your “best” sweaters, ties, socks, and “mystery outfit,” (whatever that means). Awards will be given for each of these four categories during the Ugly Sweater Christmas Party at Roofers Union. Features 15 local brews and the opportunity to exchange a donated toy (valued between $10-20) for your first beer. Roofers Union (2446 18th Street NW) 6 p.m. Free admission.