DS2 came out of school all excited today because "I'm going to X's House to play" this was the first either I or X's mum had heard of it and I have never spoken to her before. TBH I wasn't even aware who she was Anyway we had a quick chat and agreed that we'll sort something out for later in the week.
I'd prefer X came here, but suspect his mum feel the same way. It seems odd that we insist on people being vetted so much before they can work anywhere near our DC's, but we happily send them off on playdates/parties with adults we hardly know.