The fourth annual iHeartRadio Music Festival returns to the MGM Grand Garden Arena in Las Vegas this weekend. Here’s the latest schedule we could get our mitts on, and it’s a doozy:

FRIDAY NIGHT
Taylor Swift will kick off the show, followed by performances from Coldplay, Usher, Ariana Grande, Mötley Crüe (did we get the umlauts right?), Zac Brown Band, Nicki Minaj, Bastille and Steve Aoki, along with Macy’s iHeartRadio Rising Star winner Before You Exit.

SATURDAY @ iHEART VILLAGE
The second edition of the outdoor show will include performances from Iggy Azalea, Neon Trees, 5 Seconds of Summer, Kacey Musgraves, Childish Gambino, Magic!, The Pretty Reckless, Jake Miller, Nico & Vinz, Lil Jon, Fences and Meghan Trainor. A generous application of sunscreen is strongly advised.

SATURDAY NIGHT
One Direction hits the stage at 7:15pm, with performances from Paramore, Weezer, Ed Sheeran, 50 Cent, Iggy Azalea, Train, Eric Church, Lorde and Calvin Harris to follow.

Ryan Seacrest is, of course, the host.

Among the celebs scheduled to be on hand are Fergie, HilaryDuff, Nick Jonas, Jamie Foxx, Chris Pratt, Craig Robinson,Johnny Galecki of Big Bang Theory, Sophia Bush, SNL’sCecily Strong, Adam Devine, Janel Parrish, Randy Couture,Karina Smirnoff and Val Chmerkovskiy of Dancing With the Stars,and Orange Is the New Black’s Taryn Manning, Laverne Cox, PabloSchreiber and Dascha Polanco. Guest presenters from various series onThe CW include Gina Rodriguez (Jane the Virgin), ColtonHaynes (Arrow), Phoebe Tonkin (The Originals) and AdelaideKane (Reign). iHeartMedia's Elvis Duran, Ellen K,Nikki Sixx, Bobby Bones, Amy Brown, The Breakfast Club,Kane, Romeo, Nessa, Cody Alan, Johnjay andRich, Mario Lopez and Jenn Marino will also make special guestappearances.

The iHeartRadio Music Festival will be broadcast live on iHeartMedia outlets (formerly known as Clear Channel stations) across 150 markets and will stream live on Yahoo Screen each night at 7:30pm PDT.

A pair of TV specials featuring performance highlights from the fest will air on The CW on 9/29-30 from 8-10pm.

"The iHeartRadio Music Festival is the most important promotion we do," President of National Programming Platforms Tom Poleman pointed out in a joint Q&A with President of Entertainment Enterprises and fellow festival co-producer John Sykes. "The show itself is an incredible live-event experience. But it’s not just for the people in that venue; we broadcast it in every single city that [iHeartMedia] is in. So it’s a new way for people to experience a concert.

"I used to think when I was a kid, 'Boy, I wish I could actually hear what was going on at that concert that they were talking about on the air.' Now, you actually get to experience it as it’s happening. We also create a stream so you can see it as well, and then there’s that huge payoff with a great TV broadcast. And then along the way, there’s a lot of digital integration and a lot of social, and it gives us a central focus for all of our stations to be pointing towards to be a great pop-cultural moment, a great platform for artists to show the world what they’re all about."