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.
Step 3: Share the Calendar with 4-6 friends
To share with friends, they will also need gmail accounts. Go make to the main calendar window and click on the "Settings" button, which should be to the left of the "Create" button used in step 2. This will open a new window that can be used to give your friends access to the calendar. Make sure to change their permission settings so that they can edit the calendar as well as see it.
Step 4: Where to Find Events
*Career Bulletins - Sent out by CU's Career Services
*Mailing Lists - Look for alumni lists, great catered food
*On Campus Religion - Jesus is delicious
*Employer Presentations - There are hundreds of these
*Talks by Famous People - Usually not famous enough to lack the necessary attraction of food.
Look for things out of the ordinary. Pizza can get old for some people (not me).
Step 5: EAT!!!!!!!
Yesterday for example, I stole some pizza from the Puget Sound Navel Shipyard presentation, stopped by the Hillel (a christian fraternity thing, I don't really know) for some BBQ, and then topped myself off at the Jewish temple with some Chabad food. The day before I had sushi. Add some events and eventually your friends will catch on.
Be sure not to share with too many people, otherwise all the food will be gone. Also keep in mind that you don't have to be a college student for this to work. I've seen a lot of suspiciously older people in some of these events that seem to have been doing this for a while. Good luck and happy hunting!