Cut the Crap: A performance with "semi-motivational guru" Clam Lynch. Fridays, 10:30 p.m. Through Jan. 13. $12-$15. www.brownpapertickets.com. Dark Room Theater, 2263 Mission (at 18th St.), 401-7987.
Forking II: A Merry Forking Christmas: The audience chooses the plot turns and ending of this fully scripted holiday farce. Through Dec. 30. $25-$100. www.stagewerx.org. Stage Werx 446, 446 Valencia(at 16th St.).
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.
Not Getting Any Younger: Solo performance by Marga Gomez. Thursdays-Saturdays. Through Feb. 25. $15-$35. The Marsh Theater, 1062 Valencia (at 22nd St.), 826-5750.
Period of Adjustment: Play written by Tennessee Williams set on Christmas Eve about marriage, friendship, and large-scale disillusionment. Tuesdays-Saturdays. Through Jan. 14. $20-$50. SF Playhouse Stage 2, 533 Sutter (at Powell), 677-9596.
Previously Secret Information: In the words of the organizers: "Great stories, told well, with just the right amount of lies." We'll add: "Told by comedians, a lot of the time." Third Sunday of every month, 7 p.m. $10. www.stagewerx.org. Stage Werx 446, 446 Valencia (at 16th St.).