THEATER: It's the first preview night for the limited run performance of In Here, No One Will Hear You Scream..., which is part radio play, part blues show, part confessional - "a tale like no other."

8 p.m. // Brava Theater (2781 24th St) // $10

LITERARY: At Real Horror Show, four renowned horror writers, John Shirley, Ray Garton, Chelsea Quinn Yarbro, and Rain Graves, will present some chilling short readings, followed by a screening of The Changeling (1980). Seating is limited, so get there early.

6 p.m. // The Variety Preview Room (582 Market St) // free

PARTY: Grab your costume and your roller skates and head over to the Roller Disco Costume Party, as part of DocFest 2010. Skates and tunes are provided by Black Rock Roller Disco.

8 p.m. to 2 a.m. // CellSpace (2050 Bryant St) // $5-10