Summerfest razkriva zasedbo 2021 z Miley Cyrus, Dave Matthews Band, Megan Thee Stallion, Wilco, Pixies in drugimi
Chance the Rapper, Chris Stapleton, Run the Jewels, Liz Phair, Rise Against in Black Pumas so prav tako potrdili nastop na mega festivalu v Milwaukeeju septembra 2021.