Parties happen everywhere.
At one party at DS's dorm in Northeast(a.k.a. the nerd dorms), half the dorm got written up for alcohol violations and a bunch of people wound up getting kicked out of the dorm. It must have been one heck of a party...
Given that all the dorms are alcohol-free, you are at the mercy of your RA should you drink in your dorm. Some may be quicker to write you up than others.
For other kinds of partying... I don't have any info for you.
There is nothing stopping you from getting to know kids in other dorms and going wherever you want to party.