Here's what's going on today (Saturday, Oct. 13): Bonnie Raitt returns to the Johnny Mercer Theatre for an 8 p.m. performance. And blues singer/guitarist Doug MacLeod headlines the Savannah Folk Festival's free concert in Grayson Stadium, a multi-artist event from 2 to 7 p.m. The great band Cope is at Congress Street Social, Whaleboat plays Taco Abajo, and the tribute band Motley Crude does its particular thing at the Rock House on Tybee Island.