Beach Blanket Babylon:Steve Silver's musical revue spoofs pop culture with extravagant costumes.Wednesdays-Sundays. $25-$130. Club Fugazi, 678 Green (at Powell), 421-4222.
Big City Improv: Actors take audience suggestions and create comedy from nothing. Fridays, 10 p.m. $15-$20. www.bigcityimprov.com. Shelton Theater, 533 Sutter (at Powell), 433-3040.
The Business: A Comedy Show: Sketch and stand-up comedy. Wednesdays, 8 p.m. $5. Dark Room Theater, 2263 Mission (at 18th St.), 401-7987.
Forking II: A Merry Forking Christmas: The audience chooses the plot turns and ending of this fully scripted holiday farce. Through Dec. 30. $25-$100. Stage Werx 446, 446 Valencia (at 16th St.).
Monday Night Marsh: Musicians, actors, performance artists, and others stage works in progress. Mondays. $7. The Marsh Theater, 1062 Valencia (at 22nd St.), 826-5750.
Period of Adjustment: Play by Tennessee Williams about marriage, friendship, and large-scale disillusionment on Christmas Eve. Tuesdays-Saturdays. Through Jan. 14. $20-$50. SF Playhouse Stage 2, 533 Sutter (at Powell), 677-9596.
Wild Bride:Kneehigh Theater's grown-up fairy tale of a girl's journey in which her father accidentally sells her to the devil and her prince goes off to war. Includes live and found music. Complimentary champagne toast on New Year's Eve. Tuesdays-Sundays. Through Jan. 22. $17-$83. Berkeley Repertory's Roda Stage, 2025 Addison (at Shattuck), Berkeley, (510) 647-2949.
Xanadu: A Greek muse visits Venice Beach to help a young man build the first roller disco. Wednesdays-Sundays. Through Jan. 15. $26-$45. New Conservatory Theatre Center, 25 Van Ness (at Market), 861-8972.