I'm not talking about meeting up with ol, "known them since 6 months old" friends, but rather about "DD seems to be making a new friend at school, better have them over to play" occasions.
Left to my own devices it wouldn't have occurred to me to start these so early, but DD has been invited to other people's houses a number of times so naturally I have invited these children back.
On almost every occasion the child and DD have disagreed over what to play with and retreated to different parts of the house, leaving me to flit between them giving DD swift kicks up the backside pep talks about how to behave with guests, and jollying along the friend (usually a virtual stranger) so she doesn't get too freaked out. I often get the feeling that DD would actually prefer to be on her own although she claims not to want the friend to leave at the end.
So -AIBU to think that they are a bit young for this type of socialising, especially after school when they are tired? I wonder how many of us are doing it so that our DCs don't get left out, rather than because they actually enjoy these occasions.