They have lots of great events throughout the semester promoting Graphic Design, Animation, Illustration, etc. There are workshops, portfolio reviews, screenings and lots of other fun stuff. Their tumblr is a great way to keep up to date with everything going on!
Usually you have to pay to join AIGA, but is free to join the student group. They’ll also help you become a professional member if you’d like to (about $50). It’s definitely worth it as you get access to their job listings, professional portfolio fair, and you get your own online portfolio.