"Abigail: The Salem Witch Trials – The Rock Opera": Starting Aug. 18. Thursdays-Saturdays, 8 p.m. Continues through Aug. 27. $15-$20. www.abigailtherockopera.com. Light Rail Studios, 672 Toland (at Bay Shore), 285-0259.
American Buffalo: Performance of David Mamet play. Wednesdays-Saturdays, 8 p.m. Continues through Aug. 27. $26-$38. Actors Theatre San Francisco, 855 Bush (at Taylor), 345-1287.
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.
Bedtime in Detroit: Directed by Michaela Goldhaber. Thursdays-Sundays. Continues through Aug. 21. $15. Boxcar Theatre Studios, 125A Hyde (at Golden Gate), 776-1747.
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 Book of Liz: Custom Made Theatre Company presents a play by David and Amy Sedaris. Thursdays-Sundays. Continues through Aug. 28. $20-$28. www.custommade.org. Gough Street Playhouse, 1620 Gough (at Bush).
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.
La dame de Chez Maxim: Offered by the Sitdown Readers Theatre. Sat., Aug. 20, 2 p.m. free. North Beach Branch Library, 2000 Mason (at Columbus), 355-5626.
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.
Mr. Harry: A tragicomedy involving a drought, a dog, and the Berkeley City Council. Thursdays-Saturdays. Continues through Aug. 27. $15-$20. Dark Room Theater, 2263 Mission (at 18th St.), 401-7987.
The Nature Line: Third play in a trilogy about the apocalypse by J.C. Lee. Thursdays-Saturdays, 8 p.m. Continues through Aug. 27. $15-$17. www.sleepwalkerstheatre.com. The Phoenix Theatre, 414 Mason (at Post), 989-0023.
Technically Virgins Improv Presents: A Very 80's Summer Show Series: Celebrating John Hughes. Starting Aug. 19. Fridays, Saturdays, 8 p.m. Continues through Aug. 20. $10-$15. Ninth Street Independent Film Center, 145 Ninth St. (at Howard).
Peaches en Regalia: A comedic play. Thursdays-Saturdays, 8 p.m. Continues through Aug. 27. $18-$24. Stage Werx, 533 Sutter (at Powell), 730-3433.
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.
Tony 'n' Tina's Wedding: Saturdays, 7 p.m.; Fridays, 7 p.m. $88.50-$115.50. www.tonyandtinasanfrancisco.com. Imperial Palace, 818 Washington St. (at Grant), 888-775-6777.
Upper Cut Improv Showcase: Improv and sketch comedy. Fridays, 7 p.m. $5. San Francisco Comedy College, 414 Mason (at Geary), 921-2051.
Your F!#&ed Up Relationship: Improv based on real-life relationship problems supplied by audience members. Fridays. free. Alcove Theater, 414 Mason (at Geary).