Sunday is a tough night to crack for a dance party, but the new monthly 2nd Sunday has the best shot of any since Flammable. Tonight's debut features NYC electro freak-funk duo Free Blood, who opened for Hot Chip here in April and feature John Pugh, aka that lanky, stomping, falsetto singer formerly of !!!. Future nights will feature equally ambitious out-of-town talent—promoters/resident DJs Ben Cook (proprietor of Rong Music) and H.M.A. (full disclosure: Dan Savage's babydaddy) have booked Tim Sweeney for next month and hinted at DFA-affiliated heavies for the spring. (Chop Suey, 1325 E Madison St, 324-8000. 9 pm, $8, 21+.)