Free food can usually be had at least once or twice a week someplace in the Allen Center. Be sure to set things up to have cs-grads be delivered to you as mail. If you just read it as news, all the food might be gone before you find out about it.
You can also sometimes score some free food just by going office to office to see if there are any goodies left out. Of course, if you don't know the office residents, you might get scowled at. Hmmm... maybe it is who you know, not what you know...