Have just been kicked out of Harvest festival. As some things let siblings in and some don't I called and checked. Was told as long as she had a ticket and her own seat siblings could go.
Head stopped said she can't go in as no preschoolers are allowed at school performance. I said sorry, but I'd checked and that she'd been to last years performances 
Was told that they had a blanket rule on preschoolers at all performances.
I looked confused and he then reiterated actually it was only Harvest and siblings were welcome to others.
Head said we could wait in the lobby. Receptionist then came along and told us we had to leave totally, and could not wait
I have no issue whatsoever about abiding my the school policy.
Dd has sat through plenty of performances quietly. And we have had sitters when she can't attend.
AIBU to be a tiny but fucked off for being kicked out in the fadhion I was and told I should have known? It's not like I tried to smuggle her in.