Pat Benatar & Neil Giraldo, Don Felder (ex-Eagles), Mick Fleetwood (Fleetwood Mac), Dave Grohl (Foo Fighters), Sammy Hagar, Vic Johnson (The Circle, etc.), Sarah McLachlan, Steve Vai, and Bob Weir (Grateful Dead) have been set for the fourth annual Acoustic 4 A Cure benefit. This special acoustic show benefits the Pediatric Cancer Program at UCSF…