Summerfest is set for the weekends of September 2-4, 9-11, and 16-18.
Hundreds will perform such as Wilco, ZZ Top, Pixies, Rise Against, Black Pumas, and Diplo.
Headliners include Miley Cyrus, Chance the Rapper, Chris Stapleton, and the Jonas Brothers. Luke Bryan, Dave Matthews Band, and Zac Brown Band will headline the last day.
Masks will be enforced according to health department. Summerfest execs said proof of vaccination is not a requirement but things could change from May to September.