Yeah, I guess we just all need to do what we think is best for our kids, us and our conscience. I suppose it depends a lot on how old your kids are, how mature their understanding of the sitch is, their personality, and if you're able to get along with your X. SR's D is in that in between age- old enough to know what's going on in a way, but too young to really understand that just b/c they spend time together does not mean they're reuniting. I've got a 3 year old and she would only able to understand that one of us isn't there if we didn't do these occasions together and she'd wonder if one of us didn't want to celebrate with her, etc.
When the men on the chessboard Get up and tell you where to go; And you've just had some kind of mushroom And your mind is moving slow; Go ask Alice... I think she'll know.