All Atheists Are Muslim: A solo performance by Zahra Noorbakhsh. Starting Sept. 1. Thursdays-Saturdays, 8 p.m. Continues 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.
Free Shakespeare in the Park: Starting Sept. 3. 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 by Fred Raker. Starting Sept. 4. Sundays, 2 p.m. Continues through Sept. 25. Stage Werx, 533 Sutter (at Powell), 730-3433.
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. Continues through Oct. 9. $117-$186. 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.
Secret Improv Society: Underground improvisational theater. Saturdays, 10 p.m. $15. Shelton Theater, 533 Sutter (at Powell), 882-9100.
Shopping! The Musical: Songs and sketches about shopping. Fridays, Saturdays, 8 p.m. $23-$29. www.shoppingthemusical.com. Shelton Theater, 533 Sutter (at Powell), 882-9100.
Tigers Be Still: A dark comedy involving graduate degrees, art therapy, family strife, and employers with guns. Tuesdays-Saturdays. Continues through Sept. 10. $20-$50. SF Playhouse, 533 Sutter (at Powell), 677-9596.
Upper Cut Improv Showcase: Improv and sketch comedy. Fridays, 7 p.m. $5. San Francisco Comedy College, 414 Mason (at Geary), 921-2051.
Waiting for Giovanni: A new play by Jewelle Gomez. Wednesdays-Sundays. Continues through Sept. 18. $25. New Conservatory Theatre Center, 25 Van Ness (at Market), 861-8972.
Why We Have a Body: Story of a lesbian private investigator who follows men suspected of cheating on their wives. Tuesdays-Sundays. Continues 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).