All Atheists Are Muslim: A solo performance by Zahra Noorbakhsh. Thursdays-Saturdays, 8 p.m. Through Oct. 1. $20. Stage Werx, 533 Sutter (at Powell), 730-3433.
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), 882-9100.
The Business: A Comedy Show: Wednesdays, 8 p.m. $5. Dark Room Theater, 2263 Mission (at 18th St.), 401-7987.
Fauxgirls!: Drag revue. Third Saturday of every month, 10 p.m. free. www.fauxgirls.com. Kimo's, 1351 Polk (at Pine), 885-4535.
Free Shakespeare in the Park: Free theater in the main lawn. Sundays, 2:30 p.m.; Saturdays, 7:30 p.m. Continues through Sept. 23. The Presidio, Park Presidio (at Lake), 561-4323.
Geezer:Geoff Hoyle's solo performance about what it's like to grow old. Thursdays, Saturdays, Sundays. Continues through Sept. 18. $20-$50. The Marsh, 1062 Valencia (at 22nd St.), 826-5750.
How to Make Your Bitterness Work for You: Solo comedy piece written and performed by Fred Raker. Sundays, 2 p.m. Through Sept. 25. Stage Werx, 533 Sutter (at Powell), 730-3433.
Joy with Wings: A Daughter's Tale: Written and performed by Becky Parker. Wed., Sept. 14, 8 p.m. $32-$50. Alcove Theater, 414 Mason (at Geary).
Maestro's Enchantment: A story of romance between an illusionist and the leader of an 18th-century circus troupe. Features aerial acts, music, and a five-course dinner. Thursdays-Sundays. Through Oct. 9. $117-$186. love.zinzanni.org. Teatro ZinZanni, Piers 27 and 29 (Embarcadero and Battery), 438-2668.
Monday Night Marsh: Musicians, actors, performance artists, and others take the stage at this regular staging of works in progress. Mondays. $7. The Marsh, 1062 Valencia (at 22nd St.), 826-5750.
Night Over Erzinga: Written by Adriana Sevahn. Sundays, 2 p.m.; Fridays, Saturdays, 8 p.m.; Thursdays, 8:30 p.m. Through Oct. 9. $20-$36. Fort Mason, Southside Theater, Marina (at Buchanan).
Not Getting Any Younger:Comedian Marga Gomez performs solo. Thursdays-Sundays. Through Oct. 23. $15-$50. The Marsh, 1062 Valencia (at 22nd St.), 826-5750.
Waiting for Giovanni: A new play by Jewelle Gomez. Wednesdays-Sundays. Through Sept. 18. $25. New Conservatory Theatre Center, 25 Van Ness (at Market), 861-8972.
Why We Have a Body: A lesbian private investigator follows men suspected of cheating on their wives. Tuesdays-Sundays. Through Oct. 2. $20-$60. Magic Theatre, Fort Mason, Bldg. D, Marina & Buchanan, 441-8822.
Your F!#&ed Up Relationship: Improv based on real-life relationship problems supplied by audience members. Fridays. free. Alcove Theater, 414 Mason (at Geary).