"Yes, I'm going to be there with the boys. I've always liked these events with our friends and I do not plan to miss them. If you decide not to go, please extend our friends the courtesy of letting her know."
Just send this. Period. That other stuff is going to open the door to more R talk. I don't know if you've realized it, but you have a tendency to talk too much to her and fall into her traps.
Short and sweet. If she doesn't want to go, tough. You are going to be there looking good, happy and be the life of the kid's party.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.