Hi Marjorie,
I am one of the chairs for the Columbus Suburban College Fair. We have a policy regarding for-profit schools. It is my understanding that as long as you have your rules/regulations listed in your fair bylaws that you certainly can limit or not invite for profit colleges. If they have already registered, I'd be hesitant to univite a school, but for the future setting a policy may be helpful. Feel free to reach out to me if you have any questions at 614-252-8341.
Jeff