Carrie Underwood will be appearing at the iHeart Country Music Festival it was revealed on Tuesday.Other stars who will be there include Maren Morris and Thomas Rhett as well asDustin Lynch, Jimmie Allen, Scotty McCreery, Cody Johnson.Hosted by Bobby Bones, the iHeartCountry Festival will take place at the new Moody Center in Austin, Texas on Saturday, May 7. A top name:Carrie Underwood will be appearing at the iHeartCountry Music Festival it was revealed on Tuesday.