I go to the University of Colorado at Boulder. Every day there are dozens of events with free food waiting to be eaten by hungry engineering students. All you have to do is know where to go! This is my first instructable, but I've found it invaluable. I've gone for weeks without paying for food using this method (although weekends are harder to get through).
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
There may be other mail clients with calendar services, but I've found this is the easiest to use and share with friends, which is an important aspect of this instructable. Go to mail.google.com and click on the "Sign up for Gmail" link. You will have to enter some personal information like any other mail client, but it's worth it.