ART: Belljar presents Mutatis Mutandis, a series of acrylic paintings on canvas by Scott Greenwalt, in which he seeks to express intimate celebrations of abnormality, imperfection and the bizarre.

6 to 9 p.m. // BellJar Gallery (3187 16th St) // free

LITERARY: Friends of the San Francisco Public Library present the Porchlight All Stars -- a first-ever after-hours party and benefit for the library, at the library. Hosts Beth Lisick and Arline Klatte will introduce a cast of San Francisco’s legendary personalities for stories around the theme, "Urban Legends."

10 p.m. to Midnight // Main Library (30 Grove St) // $50 (buy tickets)

FOOD: The ever-popular SF Underground Market will be held at SomArts tonight, which they hope will better contain the crowd. The event will feature tons of new vendors and a few workshops. Be sure to sign up for a free membership before attending, and BYOB!

5 to 11 p.m. // SomArts (934 Brannan St.) // free (sign up first)