CLARKSDALE CARAVAN MUSIC FEST 4th annual, free music festival Saturday, May 8, 2010 downtown Clarksdale, Mississippi CAT HEAD DELTA BLUES & FOLK ART (252 Delta Ave.) - FREE! 10am till:  All Night Long Blues Band, La La, Mary Ann "Action" Jackson. ROCK & BLUES MUSEUM (113 E. 2nd St.) - FREE! 2pm till:  Theo D "The Boogieman," Selwyn Cooper, Bob Walters, Black Smoke, Little Bobby & the Storm and more.   RELATED NIGHTTIME MUSIC IN CLARKSDALE (cover charges apply): Ground Zero Blues Club (Reba Russell), Red's Lounge, Tricia's and more!   FESTIVAL MERCHANDISE: Two collectible show poster designs available exclusively at Cat Head store and Rock & Blues Museum.   MORE INFO: website www.blues2rock.com and www.cathead.biz   Also, don't miss the Clarksdale Caravan Music Fest fundraiser this Thursday night (4/29) at the Rock & Blues Museum from 5pm-9pm.