I really did not want this to become a controversy in your relationship.
While I agree with Sandi on some of her points I felt I made it pretty clear it had to be casual. No "Emotion". If she is dead set on not going by all means drop it. I could just see where she may thinks she wants to go but just isnt sure how to "dive back in".
I can't see where it hurts to let her know you want her there.
I can see doing the party and then maybe leaving the D with a family member then going with wife and new friends, or just wife somewhere.
Please don't over analyze the situation.
You are there we are here. You have a more accurate gauge. Remember I said casual, creative. Nothing more, Nothing less.
Relax Eat Think Act normal React.. Smartly. Do something different. Emulate. Do Work.