MUSIC: Organ Spectacular!, which has been bringing the organ out of the church and into underground dens since 1997, features "semi-improvised opulence, clanglorious classics and a smattering of blotpolished battletech electronics to settle over the keys." There will be films to accompany the music and POPCORN!

7:30 p.m. // The Lab (2948 16th St) // $5-15

ART: At Balancing Aesthetics and Activism, artist Christina Seely and SFAC Gallery Director Meg Shiffler will lead a walk-through of Seely’s exhibition, LUX, an exhibition of large-scale photographic banners featuring brightly illuminated cities at night. A panel discussion will follow the tour at the SFAC Gallery at 401 Van Ness. RSVP to [email protected] or call 415.554.6080.

6:30 to 8 p.m. // San Francisco City Hall (1 Dr. Calton B. Goodlett Place) // free

LITERARY: Lady Antonia Fraser, whose new book, Must You Go?: My Life with Harold Pinter, a memoir of her relationship and marriage to British Nobel Laureate and playwright Pinter, who died in 2008, will speak in conversation with writer Steven Winn, formerly of the S.F. Chronicle.

8 p.m. // Herbst Theatre (401 Van Ness Ave) // $20