Summerfest has announced additions to its lineup, with some outlets reporting on the 2024 lineup and others mentioning 2025 or 2026. The headlining acts reported to be performing at Summerfest include a variety of artists, such as Maroon 5, Bryson Tiller, Tyler Childers, and Illenium, among others. However, there is some uncertainty about the specific year and lineup, as different outlets are reporting on different years and acts.