Quote: me I'd go just for the evilishness about it...I'd go and be as cheery and comfy as possible with the other wives and ignore her...not even give her the decency of eye contact...but we all know I'm a tad evil.
Hey, for added effect you could say "do I know you?" like she really is absolutely NOTHING to you.
GO!!!!
Hold your head up HIGH! She is the OW and I am sure everyone knows it... Go just so the other women can gossip about the drama! YOU are the wonderful human who forgave her H for a MISTAKE that he made. SHE is still who/what she is... (pick whatever name you want). Don't give her power for a MOMENT to keep you away from a friend of yours. I would bet she won't come.
Relax. Appreciate. Be calm. Laugh. Enjoy. Be secure. Be loving. Be loved. Don't personalize. Don't ASSume. Accept. Be grateful.