MILWAUKEE, WI (March 15, 2022) – Summerfest presented by American Family Insurance announced today that multi-PLATINUM selling superstar Thomas Rhett, with special guest to be announced, will headline the American Family Insurance Amphitheater on Summerfest’s last day, Saturday, July 9, 2022. The countdown is on - only 100 days to Summerfest 2022, which will take place over three weekends (Thursdays…