WALKING TOUR: It's that time of year again! It's the annual Ghost Walk at City Hall. Learn all about the "disinterred remains, assassinations, and other ghostly lore" surrounding city hall. If you can't make tonight's walk, there's also the Ghost Walk at The Palace on the 30th and the Ghosts, Sinners and Secret Places on the 31st.

6:30 p.m. // City Hall (meet in South Light Court, through Polk St. entrance) // free

MUSIC: SMiLE presents "a spectacular night of fun and frivolity." Bands include Make Me, The Aerosols, Jeepster, Outlaw, and DJ Neil Martinson will spin psych, soul, glam, and disco.

9 p.m. // The Knockout (3223 Mission St) // $7

THEATER: There are a few nights left of the International Czech Theater Festival. Brick Circk, in which "a green clown with bricks everywhere and everything for the whole family," will be showing at 7 p.m. Flush, featuring a "subversive, imprisoned comic actor and his jailer/interrogator, who explore a surreal friendship that reveals the guts of power grasped, denied, and surrendered," will be at 9 p.m.

7 and 9 p.m. // The Marsh (1062 Valencia St) // $15-50