Too many pages makes it hard for a potential employer to quickly see your good points. First impressions are vital when meeting with potential employers. Even though a company might boast a casual work environment, don't come to a fair wearing a polo shirt and jeans. Sell yourself by being familiar with the company, the position and yourself. Job seekers may think the recruiter is too busy to conduct an actual interview while the exhibitor may think the job seeker isn't that interested.
Recruiters often make decisions about following up with candidates a few days after the event.
You may want to forward another copy of your resume with a specific cover letter highlighting what you discussed at the fair and how your qualifications match the job they have available.