It was insanity for fall DD. But that's IMHO, I've never done Xmas so I don't know what max capacity situations feel like. This fall was not a max capacity situation on DD but it definitely exceeded my personal max capacity!) Are you thinking of a night in downtown Disney by chance? That would be the night for it. If I had to pick a park I'd do DCA because of the space the park has for crowds since so much of DL is shut it's been feeling extra crowded. Go as early as you can for the lightest crowds & make food reservations now! And realize now you probably won't get a ton of stuff done that day, just enjoy being in DLR & seeing all the great outfits!