Tough one on Friday. I would take my boy to such a special event. I think she is doing it just to get you fired up. Dont fall into the trap if there is a confrontation with her and the other family bad apples are there to back her up. Ask your L's advice, but I think I would have a recording device along.
Ian is correct about these threads being used as a record or log of your unfortunate adventure.
I really wonder about your L's experience or where the guardian ad litem has been. As I remember, your STBXW was sending too much nit picking info to the GAL and was told to stop.
I think I got lucky because my cousin got me in touch with a very experienced lawyer who dealt with the kids best interest first, plus I had already convinced my W to leave the house. I did get a bit of Schadenfreude a couple months ago when my X acknowleged that I did have one of the best (according to her L). Leading up to the filing, she was the one threatening to find a sugar daddy so she could buy the best L. It was partly that threat and exposing the kids to her A that made me beat her to the punch in finding a good lawyer.
Your W is committing one of the worst things a divorcing/divorced parent can do - parental alienation. I am hoping the court can she through her act or her real personality shows itself to those that can judge in the kids best interest.
My brothers X blew it big time in the counselor evaluation for custody. She actually told the counselor that if she did not make a favorable report that she would kick the counselors a$$. The next thing that occured was that my brother and his X were in front of the judge and the counselor was there with an armed guard. The judge immediately gave my brother full custody.