Is it still easy to find and go to parties if you're not in a fraternity?

I like the idea of brotherhood and the parties that come with a fraternity, but since I’m premed I don’t want my grades to slip so I’m not sure if I should join one. Is it still easy to find parties if you’re not in a frat?

P.S. I’m planning on attending the University of Minnesota-Twin Cities and majoring in psychology