I'm putting the odds at 3 to 1 this finally causes a divorce. My wife will cave, call me an asshole for not allowing it, etc. etc. But there's no way I'm letting my daughter into a concert with McMurt selling edibles.Tell them your insurance won't cover them there if they're under 18. And be convincing.
Trust me - it works. Kids, for some reason, accept 'you're not covered by insurance' as legit.