Wisconsin Summerfest 2025. On monday, the festival announced that the avett brothers will headline the bmo pavilion on the second thursday of summerfest, june 26th. Summerfest 2025 has locked in def leppard as the opening night headliner at the american family insurance amphitheater.
Festival tickets and passes are not valid for admission to american family. Wildly popular country artist lainey wilson will headline the american family insurance amphitheater on thursday, june 26, during summerfest 2025.