Summerfest Wisconsin 2025 Calendar. Milwaukee — summerfest on wednesday announced its 2025 lineup featuring over 160 headliners who will take the stage over the span of three weekends. Summerfest has unveiled their complete 2025 lineup.

Milwaukee — summerfest on wednesday announced its 2025 lineup featuring over 160 headliners who will take the stage over the span of three weekends. The festival will be held on the following.