Jack White, Justin Timberlake, Carrie Underwood, and Mariah Carey will headline the iHeartRadio Music Festival when the event heads to Las Vegas’ T-Mobile Arena on September 21st and 22nd. Now in its eighth year, the festival will feature a number of hugely popular acts, including Sam Smith, Kelly Clarkson, Jason Aldean, Shawn Mendes, Panic! at the Disco, Luke Bryan, Kygo, and Rae Sremmurd. “There’s no other concert with a lineup as diverse as the iHeartRadio Music Festival. We pride ourselves on inviting the most eclectic lineup of headliners you’ll ever see on one stage,” iHeartMedia chief programming officer Tom Poleman reportedly said in a statement. “This Festival has the best artists from every style of music heard on iHeartRadio stations across America, giving both artists and our listeners a once-in-a-lifetime experience.”This year’s event will also host a Daytime Stage at the Las Vegas Festival Grounds. Performers like Dua Lipa, 5 Seconds of Summer, Lil Uzi Vert, Dustin Lynch, Bazzi, Belly, Bobby Bones & the Raging Idiots, and Greta Van Fleet will appear at the stage.iHeartRadio is set to broadcast a livestream of the festival on many of its stations. Additionally, The CW will broadcast a two-part special on the gathering on October 7th and 8th. Tickets for the iHeartRadio Music Festival will go on sale on June 15th.