Green Day, who just made headlines with their Hella Mega tour announcement (alongside Weezer and Fall Out Boy), will make their return to the iHeartRadio Music Festival on 9/20-21 at the T-Mobile Arena in Vegas. The pop/punk stalwarts join a typically eclectic lineup that includes Camila Cabello, Halsey, Miley Cyrus, Marshmello with Kane Brown, H.E.R., Chance the Rapper, Mumford & Sons, Alicia Keys, Tim McGraw, Cage the Elephant, French Montana, Backstreet Boys, Def Leppard, Heart and Hootie & the Blowfish. If you want to smash a guitar, you'll have to bring your own.