As your DH is fixated on this, any visit by your friend is going to be a disaster. You know this, of course, which is why you want advice on getting out of hosting her visit.
I think it's easy : you've known each other for a long time and you don't need to give her details or risk any great embarrassment or hurt for her. Just write or message and say that you've been putting off telling her but having people to visit now is a very bad idea because your DH is grumpy/anti-social/argumentative/disinterested....say whatever you like. You need to get away for a break and you think it would be a really good idea if you both met up somewhere for a weekend and had a great girlie time, lots of laughs, uninterrupted chat and really be able to relax and enjoy your time together.
Book it, take off and leave him to it - knowing that you won't be anxious and worrying about anything he decides to say making your friend completely miserable!
Ex-Dancer, Good Lord what a ridiculous idea. His invitation needs to be cancelled. He can't be trusted not to show himself and you in the worst possible light and ruin the wedding day of someone who doesn't deserve such treatment. Tell whoever is issuing the invitations, that he cannot be there - they will regret it always. If he cares at all about other members of the family - who will resent him forever - then he needs to manage his anger and not spread it around thinking that he will have an audience of supporters on someone's special day. With what he's planning, he won't!
A better word than 'apologise'?
Lighthearted - How long do you display Birthday Cards?


