so My ds desperately wants to invite some kids from pre school over on a weekend to play during the day (not a sleepover or anything)..

The trouble is, we don't know their parents (I have said hello to one of the mums on the way in and she was on her way out).We always arrive at pre school after the parents have already been, and the parents don't pick their kids up at the same time as me, hence why we all don't know eachother.

would it be acceptable to leave a note in the parents pigeon hole to say please call to organise a play date?? not sure how to word it. what would you do?