Thanks for the post, neo. I hadn't connected the dots that way, but in rereading...
I do agree that it is important, in a blended situation, for the entire family to spend time together. BUT... it is also important for each of the children to feel valued by having his/her activities, if not attended, at least facilitated.
The initial mention of the Saturday evening team meeting came across as an adult meeting. Given that it is not, I can understand not cancelling it. However, if the son wants to do the Derby (and not having the stuff for it until a few weeks ahead isn't all that unusual, so doesn't indicate a lack of interest), then Dad should try and figure out how to make it happen, even if it does mean forfeiting that time. Between work & daughter's school meeting, Dad won't be spending that much time with his son anyway, ya know?
Two months' notice for a camping trip? Seems reasonable. It would be great if Dad could take him on it. IMO.. I didn't ask for every single thing, but the big ones? I sure did. And Dad made accommodations. I'll admit, I still wonder what possessed me to request a switch for Klondike... who the heck wants to spend the day/weekend traipsing around in 0 degree temps???
Again, in THIS, my ex was quite reasonable