One of the other reasons for obtaining the list of organizations that will be attending the career/job fair is so that you can prepare a strategy.

This advice may sound a bit extreme, but to enhance your chances for success, you should develop a plan of attack -- actually map your route of organizations you plan to visit, in priority order. Place the prospective employers that have the best fit and with which you have the most interest first on the list -- and work your way downward.

One final note: Even though you will visit/interview with your primary prospective employers first, it also makes sense -- if you have time (and if the recruiters are not overly busy) -- to double back and thank the recruiters again as you make your way out of the fair.