Arranging time with the kids for the holidays is going to be an issue for years. My advice is to bend-over backwards to accommodate your kids. Do not put a premium on the day, just the time spent. "Dad, mom is insisting on getting together for Christmas Eve, and we have my spouse's side on Christmas. Could we do Christmas with you on Saturday?" Accommodate that. Do not get into the game of "Your mom gets Christmas Eve she is more important to than I am!" Be the bigger person. The time with your kids (and grandkids assuming you have some) is the important thing, not the day. The problems always arise when pettiness rules the day. Remember, your adult kids are caught in the middle of juggling all of this. Make it as easy for them as possible.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712
