I know I will tread carefully, but when W initially left, she said she wanted to continue to do these as a family. I’m of the opinion that is cake eating....and having separate holiday/birthday celebrations are a part of D. I know others have different thoughts on how to handle these...but at my S age I don’t want to give any confusion or false hope.
Are you sure you are not trying to use that as leverage for her not to D you? Getting together a couple times a year will not confuse your son.