Park city is Utah's Party Town! For a New years eve celibration your best bet is to come over to Pak City . All the ski areas will have something going it isn't to uncommon for Main St to be so packed with people that they close it to Traffic on new years eve. There are a lot of bars, saloons good places to eat. You will have a great time on New years in Park City. Besides if you don't drink to much you can ski the morning while making fun of the hung over lifties. I did ski one year when there was 6 inches of fresh and vary few people out skiing. It made for a vary special New Years day.
Alta has a torchlight parade every year;http://alta.com look at "events"
after that, it's pretty quiet. Over in Park City, there's a big outrage about go-go dancers at the Monkey Bar on main street. Guess I'll have to stroll over there and see what all the fuss is about. :