8: The Play: Chronicles the historic trial of the constitutional challenge to California's Proposition 8. Sun., Oct. 7, 7 p.m. $50-$100. American Conservatory Theater (A.C.T.), 415 Geary (at Mason), 749-2228.
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.
Bloody, Bloody Andrew Jackson: A musical about former president Andrew Jackson. Tuesdays-Saturdays. Oct. 9-Nov. 24. $20-$30. SF Playhouse, 533 Sutter (at Powell), 677-9596.
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.
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.
The Fifth Element: Live on Stage: A stage adaptation of the film. Fridays, Saturdays, 8 p.m. Oct. 5-27. $20. Dark Room Theater, 2263 Mission (at 18th St.), 401-7987.
Fortunate Daughter: A one-dyke show by Thao Nguyen about the difference between coming out and coming home. Saturdays, Oct. 6-27. $20. Stage Werx 446, 446 Valencia (at 16th St.).
Honeycomb Zone: An interactive performance involving martial arts, acrobatics, modern jazz, flamenco, and theater. Tuesdays. Through Oct. 16. free. United Nations Plaza, Market (at Seventh St.), 674-9701.
Hot Mess 3: Third Time, No Charm: Sketch comedy. Oct. 4-6, 8 p.m. $15. New Conservatory Theatre Center, 25 Van Ness (at Market), 861-8972.
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 take the stage at this regular staging of works in progress. Mondays. $7. The Marsh Theater, 1062 Valencia (at 22nd St.), 826-5750.
The Normal Heart: Larry Kramer's 1985 drama about the AIDS epidemic in the gay community. Through Oct. 7. $20-$70. American Conservatory Theater (A.C.T.), 415 Geary (at Mason), 749-2228.
Of Thee I Sing: A political satire-infused musical. Book by George S. Kaufman and Morrie Ryskind. Wednesdays-Sundays. Through Oct. 21. $25-$75. Eureka Theatre Company, 215 Jackson (at Front), 788-7469.
Oleanna: David Mamet's play about a college student, her professor, and sexual harassment. Wednesdays, Fridays, Saturdays. Through Oct. 13. $15-$18. Brava Theater Center, 2781 24th St. (at York), 641-7657.
The Other Place: Scientist Juliana Smithton unravels a personal, 15-year-old mystery. Tuesdays-Sundays. Through Oct. 14. $20-$30. Magic Theatre, Fort Mason, Bldg. D, Marina & Buchanan, 441-8822.
The Play About the Baby: By Edward Albee: A young couple have a child — the perfect family — that is, until an older couple steal the baby. Thursdays-Sundays. Through Oct. 7. $15-$30. The Custom Made Theatre Co., 1620 Gough (at Austin), 798-2682.
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.
Speed the Plow: ATSF completes the Business Trilogy. Wednesdays-Saturdays, 8 p.m. Oct. 5-Nov. 10. $26-$38. Actors Theatre San Francisco, 855 Bush (at Taylor), 345-1287.
The Strange Case of Citizen de la Cruz: A political thriller by Luis Francia. Thursdays-Sundays. Through Oct. 13. $10-$20. Bindlestiff Studio, 185 Sixth St. (at Howard), 255-0440.
Thunderdome: The Monthly Improv Cage-Match: Monthly show features three improv troupes; the first two compete to see which will be the headliner the following month. First Wednesday of every month. Through Dec. 5. free. Stage Werx 446, 446 Valencia (at 16th St.).
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 their very given names. Thursdays-Sundays. Through Oct. 21. $36-$57. Marin Theatre Company, 397 Miller (at Evergreen), Mill Valley, 388-5200.
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.