5 things you didn't know about iHeartRadio Music Festival
iHeartRadio/YouTube

The iHeartRadio Music Festival 2018 is three months away, and with an all-star lineup, it's a music festival to look forward to when it descends on T-Mobile Arena on Sept. 21 and 22. But how well do you know the iHeartRadio Music Festival? Here are five facts you may not know about Las Vegas's biggest music festival before you get your tickets and VIP packages to iHeartRadio Music Festival 2018 now at AXS.

1) It's a relatively new festival

It feels like the iHeartRadio Music Festival has been around forever, but that's actually not the case. The first iHeartRadio Music Festival was held in 2011, and it wasn't until 2013 that the festival added its Daytime Village. The show then moved into its current home at T-Mobile Arena in 2016. For an event that's not even a decade old and has already gone through a few changes over the last seven years, the iHeartRadio Music Festival has quickly carved out a place in Las Vegas and in the overall music festival scene.

2) This is where Green Day exploded

The 2012 iHeartRadio Music Festival is where Green Day lead singer Billie Joe Armstrong had his infamous outburst after finding out that the band's set was going to be cut short.to provide extra time for Usher's performance. After Armstrong voiced his ire at the decision, he and bandmate Mike Dirnt smashed their instruments before leaving the stage. Green Day hasn't performed at the iHeartRadio Music Festival since, though there don't appear to be too many hard feelings; the band partnered with iHeartRadio for their album release party in 2016.

Related: 5 must-see artists at iHeartRadio Music Festival 2018

3) There's an American Idol connection

Three of the biggest names in "American Idol" history are also part of iHeartRadio Music Festival history. Kelly Clarkson and Carrie Underwood were both part of the inaugural iHeartRadio Music Festival lineup in 2011, with "Idol" host Ryan Seacrest also serving as festival host for that opening year. If you missed it, you'll get a second chance this fall, because both Clarkson and Underwood are performing at iHeartRadio Music Festival 2018. It's the first time either of them has returned to the festival in seven years.

4) It has two spin-off festivals

The iHeartRadio Music Festival isn't just one festival; it's a franchise. The festival's parent company iHeartRadio spun off the festival's concept and framework into the iHeartRadio Fiesta Latina, which is a festival for Latin music, in 2014. That same year, country music fans were treated to the iHeartRadio Country Festival. Both spin-off events are going strong to this day, although the original iHeartRadio Music Festival still features several country artists in its lineup; this year, Luke Bryan and Dustin Lynch are among the headliners.

5) It's made for television as much as live entertainment

Like many iHeartRadio properties, the iHeartRadio Music Festival has a presence on TV in addition to the live event. VH1 broadcast iHeartRadio Music Festival 2011, while every year since has been shown by The CW. These broadcasts are always delayed, though, with the 2011 show not making it to TV until November - a full month after the festival happened. That means the best way to catch these blockbuster performances is still to do so live and in person - and AXS has the tickets and VIP packages that will allow you to do just that.

Tickets for iHeartRadio Music Festival  2018 are on sale now through AXS. They include pit passes, two-day passes, and the iHeartRadio VIP Package that features tickets to both stages and access to a private lounge and restroom. Play the video at the top of this article to see the festival's entire lineup and don't miss all of the buzzworthy performances in Las Vegas this September.

For more on the iHeartRadio Music Festival, visit the event page at AXS.