As far as banning immoral performances in general (I don't know anything about Iron Maiden), I have no problem with localities doing that. It's probably a counter-productive effort, though.
I can understand her stance on most things but Iron Maiden are a theatrical rock act. A lot of their songs centered around revelations etc and they had a large skeleton dressed in denim who moved around the stage. Nicko the drummer is a Christian, Bruce Dickinson, lead singer is a fully fledged pilot for large passenger aircraft and used to fly their own jet. They have had so many members it’s hard to name them all. These are not the death metal, burn down churches, satan worshiping, norse metal, neo-nazi, pagans that are prevalent now in some parts of Europe!
You could just stick an 18+ restriction on the concerts, that’d be a good idea.
Anyway, she’s a tad too old for me, but we could be soul mates. heh.