In the past two weeks I've had childen with gluten and dairy intolerance, a vegetarian, one with possible nut allergy (parents didn't know that we have a nut free house), one who doesn't eat wheat because it upsets their digestion (and who turned out to eat hardly anything except rice and meat) and one who isn't allowed to change in a public changing room (invite made it clear they were going swimming). AIBU to expect that the parents should either have phoned to warn me or ensured that their teen did?
I would NEVER let my nut allergic child go to a sleepover without making sure they had phoned to check the mother knew and was willing to cater for them.