Grateful Dead, New Riders of the Purple Sage, The Band, Janis Joplin, Delaney & Bonnie, Mashmakhan, James & the Good Brothers, Charlebois, Ian & Sylvia, Buddy Guy, and Tom Rush
Alan Bershaw supplies this facebook post with a photo, video clip, and this tantalizing tidbit, Garcia is "playing a Telecaster previously owned by George Harrison - same one he played on the Apple rooftop gig!". Old TJS notes call it the "Let It Be" Tele.
This was a 2 day festival but the Dead and NRPS only played in the stadium in the 4th, not the 5th.