As you know, the big day up here is the 24th, not the 25th.
I always bring out my very finest equipment on the morning of the 24th for a grand shaving experience.
Normally I shave at night, but that is one day where I will always shave in the AM.
On Christmas day I never worry about shaving.
That is a day too full of activity, both indoors and outdoors, to worry about stubble