I think accepting an invite you’ve wanted to for years is a great idea. A way to remind your body and the pent-up (understandably!) anxiety inside that there are still going to be positive, enjoyable experiences on the path ahead. For you and your children.
I just read through all of these posts for the first time, and I know you don’t know me, but I’m so unbelievably impressed with you. You are doing one of the hardest things, and it’s going to give you and your kids such a brighter future.