Justin Timberlake Justin Timberlake

The star-studded lineup for this year's iHeart Radio music festival includes Justin Timberlake, Elton John, Katy Perry and others, ClearChannel announced Monday.

The two-day event, hosted by Ryan Seacrest, will take place Sept. 20 and 21 at the MGM Grand Garden Arena in Las Vegas. Other scheduled performers include Chris Brown, Keith Urban, fun., Bruno Mars, Maroon 5, Tim McGraw and Ke$ha. Adam Lambert will also fill in for the late Freddie Mercury and perform with Queen.

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Also performing at the separate "iHeart Radio Music Festival Village" as part of the event are Miley Cyrus, Avril Lavigne and more.

The event will be broadcast live across ClearChannel stations, as well as the subject of a two-night special on the CW on Sept. 30 and Oct. 1.

Tickets go on sale Saturday, July 20 at 1 p.m. ET. Check out the full lineup here, and watch Urban, Seacrest and Cyrus announcing the performers below: