So you wouldn't mind seeing Jack-O-Lanterns in TESO? Or Santa? Because I would take issue with that. TES has its own universe, no need to fill it with real holidays. It wouldn't fit with the lore at all.
I really wouldn't like this either. If they want to create something in the lines of halloween and christmas, then at least give it a spin to make it as Elder Scrolls-y as can. They would have to create an entire story behind the whole event aswell. How it has come to be etc.