@LardLizard. Well it's good you've clarified that.
You have different expectations of a sleepover party than perhaps the majority of rest of us. And that's ok, that's you're right but that bit didn't make partymum was BU.
What time did sleepover start? 10am and then went in for 24-28 hours? Or merely started mid afternoon for a next morning pick up?
I wouldn't expect children at a sleepover to go out to park or somewhere to get out of the house during the day, as usually sleepover is exactly that, a house party, not a base to go out from.
Also, the food you (OP) described as junk food, isn't really that, it's typical party food. I wouldn't expect a sit down with
freshly cooked meat, salad or vegetables meal (non junk food) at a sleepover birthday party and I suspect DCs will live to fight another day even if they did eat junk food (including pizza & sweets) for 24 hours! It's all part of the fun of a sleepover/ party...!
Did you get to bottom of why DD slept out on landing rather than in room or whether she agreed to bed separate in hallway or door was open? That bit is bizarre.
(It's hard to imagine set up- sooooo want a diagram- as my landing isn't that big!!! And my landing would be cold as in direct line of draft from front door/colder downstairs hallway.)
It still doesn't feel right to exclude one DC in party from room and probably wasn't a good mix of sleepover buddies. So I'd be unhappy about that bit.
I do kinda feel OP, that you are picking unreasonably a bit on food and activities part, as you have your different sleepover expectations.