I’ve done a few house parties for both
my children (of about 15 children) when my children were 7-8 and it was mayhem. The kids were all super excited (not a problem) but I just couldn’t relax as I was so scared I was going to lose one of them 🤣
We had lots of planned activities and hid anything we didn’t want broken but it’s impossible to keep your eyes on every child!
It was lots of fun but when pick up time came and the parents were lining up outside the front door all I could think was “Please God let their child appear when I call their name” 🤣
It was exhausting but the kids loved it!
I do think chikdren get more hyper and excited at house parties than venue parties!
But anyway, back to you OP.
I would let him go OP. The hosts have made the decision to have the party at their house, I’m sure they are semi-prepared for what to expect and they consequences will be there’s to deal with.
Just give your son a little talking to before he goes about the importance of behaving in other people’s houses and being careful of their belonging, then drop him there and run 🤣
Explain to the other mum that you’ve spoken to him about being respectful but that he may be get over excited as it’s his first house party, and just ask her to call you if he gets out of hand.
That way she knows you have you have spoken to him and therefore you have shown you are considerate of her home and you have also given her a “get out” if she does find it all a bit too much if he does play up.
I wouldn’t want him to miss out.