I've been to Glamis every Xmas and New Years since 2010...
Its exactly as Lincster says...
Busier New Years, than Xmas. But still a busy time of year there. But its not really a problem if you got a good campsite with lots of Rv's too circle the campsite...
If you only go to Olds or the drags, then yes, if its good weather like usual it will be a mob scene for sure. 10,000 people at the hill. Be careful, I wouldn't let my kids lose on the hill when its that crazy there.
Heading to the hill at night with some firewood, get to the top south side and watch the crazy stuff racing up the hill, at a distance. Thats fun to watch, and reminds me of what not to do on the hill, ever.
I can take the hill during the day for just a little while. Much prefer going way out to hill 5, 6, taco bowl, the wall, etc,and all those awesome ridges. Playing around out there is what I go to Glamis for, mostly. Even on the most crowded weekends its never busy out there, and maybe the best dunes and ridges to ride, for days... Lots of times don't see anyone but us out there. Many weekend duners hang at the hill and the drags and never make it out to hill >2...
I like the holidays at Glamis, fun to see all of us there having fun. But its like a good size city on busy weekends. Including all the good and bad things that happen in city of its size, without a stop sign/stop light in site... Couple years ago there was 200,000 people out there for Thanksgiving... All The holidays are busy...
jmo