Assassins: Sondheim's musical about presidential assassins. Wednesdays-Sundays. Through Oct. 28. $20-$30. Shotgun Players, 1901 Ashby (at Martin Luther King), Berkeley, 510-841-6500.
"Audium 9": Spatial electronic orchestrations and sound sculptures. Early arrival is advised. Fridays, Saturdays, 8:30 p.m. $20. Audium-Theatre of Sound-Sculptured Space, 1616 Bush (at Franklin), 771-1616.
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.
Bollywood Sleeping Beauty: An Indian twist on a classic tale. Saturdays, Sundays. Through Oct. 14. $10-$15. New Conservatory Theatre Center, 25 Van Ness (at Market), 861-8972.
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.
Clown Cabaret: Pi: the Physical Comedy Troupe and the Clown Conservatory perform circus arts. First Monday of every month. Climate Theater, 285 Ninth St. (at Folsom), 673-1374.
Dean Obeidallah: Dean Obeidallah performs stand-up for one night only. Thu., Sept. 27, 8 p.m. $20. Cobb's Comedy Club, 915 Columbus (at Mason), 928-4320.
Will Durst's Elect to Laugh: A comedy show chasing down the presidential election from a San Francisco comedian who once ran for mayor. Tuesdays. Through Nov. 6. $15-$35. The Marsh Theater, 1062 Valencia (at 22nd St.), 826-5750.
Honeycomb Zone: An interactive performance involving martial arts, acrobatics, modern jazz, flamenco, and theater. Starting Oct. 2. Tuesdays. Through Oct. 16. Free. United Nations Plaza, Market (at Seventh St.), 674-9701.
Invasion!: A play on Middle Eastern identity. Wednesdays-Sundays. Through Sept. 29. $15-$30. Boxcar Playhouse, 505 Natoma (at Sixth St.), 776-1747.
Kiss of the Spider Woman: Based on the banned novel by Manuel Puig. An intricate game of cat and mouse between two men forced to share a jail cell in a Latin America. Thursdays-Saturdays. Through Sept. 29. $20-$35. The Phoenix Theatre, 414 Mason (at Post), 989-0023.
Kurt Weitzmann: Kurt Weitzmann performs stand-up comedy about historical San Francisco. Sundays, 7 p.m. Through Oct. 28. $20. Our Little Comedy Club Theater, 287 Ellis (at Taylor), 928-4060.
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.
Mystical Abyss: A multidisciplinary theatre play which melds Noh theatre, Japanese animation art, and Native American dance and music. Sept. 27-30. $22-$45. ODC Theater, 3153 17th St. (at Shotwell), 863-6606.
The Normal Heart: Larry Kramer's 1985 drama about the AIDS epidemic in the gay community. Tuesdays-Sundays. Through Oct. 7. $20-$70. American Conservatory Theater, 415 Geary (at Mason), 749-2228.
The Other Place: Scientist Juliana Smithton unravels a personal, 15-year-old mystery. Tuesdays-Sundays. Through Oct. 7. $20-$30. Magic Theatre, Fort Mason, Bldg. D, Marina & Buchanan, 441-8822.
The Play About the Baby: A young couple have a child — the perfect family — that is, until an older couple steal the baby By Edward Albee. Thursdays-Sundays. Through Oct. 7. $15-$30. The Custom Made Theatre Co., 1620 Gough (at Austin), 798-2682.
Rigoletto: The 90th season opener of the San Francisco Opera. Tuesdays, Wednesdays, Fridays-Sundays. Through Sept. 30. $22-$340. War Memorial Opera House, 301 Van Ness (at Grove), 864-3330.
Secret Improv Society: Underground improvisational theater. Saturdays, 10 p.m. $15. Shelton Theater, 533 Sutter (at Powell), 433-3040.
Shocktoberfest 13: The Bride of Death: An evening of horror and comedy from Thrillpeddlers. Thursdays-Saturdays, 8 p.m. Through Nov. 17. $25-$35. The Hypnodrome, 575 10th St. (at Bryant), 377-4202.
Shopping! The Musical: Songs and sketches about shopping. Fridays, Saturdays, 8 p.m. $23-$29. www.shoppingthemusical.com. Shelton Theater, 533 Sutter (at Powell), 433-3040.
Some Thing: Art drag night with craft table. Fridays. $5. The Stud, 399 Ninth St. (at Harrison), 863-6623.
Squeeze Box: Ann Randolph's performance about working the graveyard shift at a homeless shelter for mentally ill women. Sun., Sept. 30, 5 p.m. $50-$500. The Marsh Theater, 1062 Valencia (at 22nd St.), 826-5750.
The Strange Case of Citizen de la Cruz: A political thriller by Luis Francia. Sept. 29-Oct. 13. $10-$20. Bindlestiff Studio, 185 Sixth St. (at Howard), 255-0440.
To Be Merry: One woman comedy show. Through Oct. 14. $10. Exit Theatre, 156 Eddy (at Taylor), 673-3847.
Tony 'n' Tina's Wedding: Fridays, Saturdays, 7 p.m. $88.50-$115.50. www.tonyandtinasanfrancisco.com. Imperial Palace, 818 Washington (at Grant), 956-9888.
Topdog/Underdog: Lincoln and Booth are brothers ensnared in a dangerous sparring match fueled by their poverty, race, family history, and given names. Sept. 27-Oct. 21. $36-$57. Marin Theatre Company, 397 Miller (at Evergreen), Mill Valley, 388-5200.
Tripping on the Tipping Point: A musical comedy about climate change. Thursdays-Saturdays. Through Sept. 28. $10-$20. Stage Werx 446, 446 Valencia (at 16th St.).
Twelfth Night, Othello, and Henry V: A roundup of Shakespeare plays. Fridays-Sundays. Through Oct. 7. Free-$80. Hyde Street Pier, 499 Jefferson (at Hyde), 447-5000.