When Is Milwaukee Summerfest 2024. Ajr with carly rae jepsen, rico nasty, muna, hippo campus and many more will take the stage.  — milwaukee — summerfest 2024 has arrived.

 — here’s a confirmed list of dates and locations for outdoor festivals and fairs taking place in the milwaukee area in 2024, from late may through early september.  — here’s the 2024 summerfest lineup, organized by day so you can plan your ultimate fest.