this, but it is outside of ogden, an hour-ish north of slc.
if that is a problem, go to solitude.
even the busiest day at solitude isn't as busy as an average day in lcc.
christmas day itself isn't too terrible, many of the utah residents do the family/church thing so it's mostly tourists on the hill i've noticed. still busy though. this year, with christmas being on a friday, expect that sat and sunday (and maybe thursday too, a lot of people get christmas eve off) to be super packed though, especially if there is a good amount of snow by then.