Veteran blues guitarist Eddie C. Campbell plays a free show tonight at the Old Town School of Folk Music (4544 N. Lincoln) in the last concert of the long-running AfroFolk festival. Reader critic David Whiteis says Campbell “specializes in jaunty, irresistibly danceable rhythms overlaid with lithe guitar lines, often placed so tightly in the pocket of the beat that his lead guitar almost doubles as a rhythm instrument.” Tickets, while free, are required: score them by calling 773-728-6000. The show starts at 8:30 PM.