We have plans that weekend already as you can see from the online calender.
I'm VERY hesitant to go that route. Right now the calendar says "with daddy" on that weekend. Doing what you're suggestion sounds like it just gives XW a weapon to further beat me over the head with. "You don't have plans on that weekend, so you should let me do what I want!" or "I don't think you should take D to a tractor pull" or whatever (I don't think I would take D to a tractor pull, but you see what I mean).
I thought parallel parenting was "you do you thing and I do my thing?" How does giving XW more insight into my life help that? Not being a smartass here, I'm really just wanting to better understand this.