Good shout re the lunch, it will be appreciated, whether you know about it or not it another question.
As for the sense of humour I'm liking it, good for the PMA.
Dinner for birthdays - great. Your chance to show how fabulous you are - get a new frock, smile a lot. Let him see what he's missing. Have a great time.
We do the birthday thing too. It occurs to me that our H must realise that they will never be able to do family stuff like that with the OW (my kids wouldn't allow it) sad really