My suggestion to all people interested in this subject of food service with a contracted group is to really know your contract. This is signed between your University and a food service provider, and is often an exclusive agreement. You've probably got many nice people who suggest that they are allowed to be the exception to every rule in this book. Of course, your food service wants to pick and choose what groups it takes. They don't want any group that is not going to make them a nice tidy profit.
Colleges have to be ready to serve anybody anytime.
That's why colleges collect bids and sign exclusive agreements with food service providers. I know that when I worked in dining services, while I had a right of first refusal, in over 10 years, I never used it once. Why, because in most cases, the contract didn't really give me that option. In most cases, my contract for the summer months was written differently than for the school year. In order to keep the dining halls open, I passed on more of the expenses to the administration.