I think some of these steps may seem like I'm plugging google, but really its only because that's the application I used to get so much free food. By the way, this can work for non-students too; they never (repeat... never) check for students IDs at these events, at least at the University of Colorado. If you know how to make a google calendar and share it with people, you can skip steps 1-3.
By the way the "Grad Wine and Cheese" event in my calendar is real, and was incredibly delicious, as well as intoxicating (there aren't a lot of Religious Studies grad students, and they had way too much wine). By the way, I'm an Aerospace Engineering senior. I only wish I could have though this up sooner.
Step 1: Get a Gmail Account
Step 2: Create a Google Calendar
This should open a new window. Name your calendar, give it a good description and click on the "Create Calendar" button.