Local artist and promotion machine DJ Danny Dance has teamed up with the Salt City Derby Girls—fresh off the league’s 2009 championship battle, with Leave It to Cleavers trouncing Sisters of No Mercy—to host an evening of free rollerskating! Dance and DJ Freq-Sho will provide the soundtrack to the night (7-10 p.m.), which also includes a screening of Xanadu. Bring your own skates and re-enact scenes from Whip It - or your favorite SCDG match.--- It all goes down tonight at the Gallivan Center. 239 S. Main.