The Midwest Rock Festival was a music festival held at the State Fair Park in West Allis, Wisconsin, on July 25–27, 1969. The festival featured Led Zeppelin, Buffy Sainte-Marie, The First Edition, Sweetwater, Pacific Gas & Electric, SRC and Shag (July 25); Blind Faith, Delaney and Bonnie and Friends, Shag, Taste, John Mayall & the Bluesbreakers, MC5 and SRC (July 26); and Johnny Winter, Joe Cocker and the Grease Band, Bob Seger System, Jim Schwall Blues Period, MC5, Zephyr, Shag, Litter and SRC (July 27). The show had a flatbed trailer as a stage set on the field in front of the racetrack grandstand.