-- Treat or Trick!: Ack, it's Halloween in July! SFShenanigans invite you to hand out candy at the Civic Center BART station tonight (at the platform closest to the Embarcadero.) Why? Just...because. So, dress up in your Halloween-ian finest! Bring fun-sized treats to pass out to weary BART riders! Spooktacular, drunk fun for all! 6 p.m.-8 p.m. at Civic Center BART, Market and Leavenworth; free.

-- Your Mommy Kills Animals: Although we're voracious meat eaters, this "multifaceted" documentary about the animal-rights movement (and then some) is wonderfully titled. Film screens at 7 p.m. and 9 p.m. at the Roxie, 3117 16th St.; $4, $8.

-- "Playboy": Juanita MORE! welcomes back to SF the co-creator of "Playboy"--Ryan Robles. His attention to the club night's guests (platters of free shots at midnight) and to creating a safe space for irony-free cocktail attire helped turn this night into a highly successful and heavily inebriated one. A mixed crowd (sort of) grooves to DJ James Glass' dance floor-friendly beats. 10 p.m.-4 a.m. at The Stud, 399 Ninth St.; $8.

-- Johnny Mathis: Famed balladeer croons his way right back into your heart at 8 p.m., Davies Symphony Hall, 201 Van Ness; tickets are $20-$83.