articleThe Brief Ed Sheeran will headline the American Family Insurance Amphitheater during Summerfest 2026. Tickets go on sale on Friday, Sept. 26 at 10 a.m. Summerfest 2026 will take place across three weekends: June 18-20, June 25-27 and July 2-4, 2026. Summerfest officials announced on Thursday, Sept. 18 that Ed Sheeran will headline the American Family Insurance Amphitheater on June 25. What we know:Tickets go on sale on Friday, Sept. 26 at 10 a.m. at Ticketmaster.com or in person at the American Family Insurance Box Office and includes admission to Summerfest the day of the show. FREE DOWNLOAD: Get breaking news alerts in the FOX LOCAL Mobile app for iOS or AndroidSummerfest 2026 will take place across three weekends: June 18-20, June 25-27 and July 2-4, 2026.