The XPoNential Music Festival kicks off tonight at Wiggins Park on the Camden Waterfront. Featured acts will include The Blind Boys of Alabama, Beth Orton, Alejandro Escovedo, Amos Lee, Ingrid Michaelson, and Joan Osborne. (Remember her? We do, too!) Tickets are available for $25 a day ($17 for XPN Members) or $60 for a four-day pass ($40 for XPN members) online or at the door.......