Summerfest, the annual nine-day musical festival in Milwaukee, Wisconsin, has revealed a star-studded lineup for the 2022 edition. The festival will feature Justin Bieber, Halsey, Machine Gun Kelly, Backstreet Boys, Lil Wayne with Wiz Khalifa and Wu-Tang Clan, Rod Stewart with Cheap Trick, Jason Aldean with Gabby Barrett and John Morgan, Charli XCX, 2 Chainz,…