WBCN Rock 'n Roll Rumble Finals w/ A.K.A.C.O.D., Girls Guns & Glory, The Great Bandini, Guests: The Neighborhoods Harpers Ferry, 158 Brighton Ave, Allston April 25, 9:00 p.m., $15, 18+. Details After six preliminary and two semi-finals shows, 24 invited bands have been whittled to three potential winners of the 30th Rock 'n Roll Rumble title. The judges usually end up with a worthy lineup of finalists, and it'll be a strong dash to......