(Milwaukee, WI) — The lineup for Summerfest 2023 is falling into place. Organizers yesterday announced the Zac Brown Band will be one of next summer’s headliners. They will play at the American Family Insurance Amphitheater on June 23rd. The Zac Brown Band is no stranger to Milwaukee or Summerfest, but they took last year off. Summerfest will once again be three-weekends next year, starting on June 22nd.