Amid strict COVID-19 protocols, the iHeartRadio Music Festival returned to Las Vegas’ T-Mobile Arena over the weekend of Sept. 17 and 18. Acts including Dua Lipa, Finneas, Nelly and Weezer kicked off the concert showcase on Friday night, with Coldplay, Billie Eilish, Khalid and Sam Hunt among the highlights of Saturday’s lineup. The Daytime Stage also returned with Olivia Rodrigo, The Kid LAROI, All Time Low, Yungblud and more. Variety was backstage with stars from music and beyond.