(ROLLER DERBY) The Rat City Roller Girls cap off a stellar inaugural season with a championship bout. Will the galactic gals of the Throttle Rockets skate away with the title? Or will the rabble-rousing revolutionaries of the Derby Liberation Front nab the victory? Also on tonight's bill is a grudge match between Grave Danger and the Sockit Wenches, plus preshow and halftime live bands, and a Showbox-sponsored beer garden. Get there early, seats fill up fast. (Magnuson Park Hangar 27, 7400 Sand Point Way NE. 4:30 pm doors, 6 pm bout, $15 adv/$18 DOS. All ages, beer garden w/ID.)