PRIDE: Have a gleeful evening with fabulous host Trauma Flintstone at the 33rd Annual Pride Concert, featuring five groundbreaking ensembles -- Bay Area Rainbow Symphony, Lesbian/Gay Chorus of SF, SF Lesbian Gay Freedom Band, with special guests Golden Gate Men's Chorus and SF Gay Men's Chorus Ambassadors. (8 p.m., Everett Auditorium, 450 Church Street) (Looking for some Pride parties? Check them out here!)

ART: The Lab gives its ceiling at the Redwood Building its proper due at A Floorless Room Without Walls, in which work by eight artists will adorn the ceiling instead of the walls, including a sculptural tautology, optical effects, and the image of another space, among other unconventional media. (7 to 10 p.m., The Lab, 2948 16th Street)

PHOTOGRAPHY: The latest 200 Yards exhibit centers around Dickerman Prints Photo Lab, in which fifteen photographers snapped shots of what they saw within a 200 yard radius. (6 to 9 p.m., Dickerman Prints Photo Lab, 3180 17th Street)