I saw Def Leppard open for Billy Squier too at the old, old Charlotte Coliseum on Independence Blvd. Must have been 83’ or 84’ as I was still HS. It was soon after the Pyromania album came out and Photograph was hit. They blew up soon after and I saw them again headlining later the same year. I liked Billy Squier but he fell way short of his opening band that night. Other good openers - Eddie Money for 38 Special, John Cougar (no Mellincamp yet) for Heart, Loverboy for Heart, Joe Walsh for Stevie Nicks, Lenny Kravitz for Tom Petty, Shawn Mullins for John Gorka, Reckless Kelly for the Flatlanders, Iris Dement for John Prine and Keb Mo for Bonnie Raitt. I also saw John Prine and Lyle Lovett open for Bonnie at different shows but they were both well established at the time so not really in the same vein.