The problem with job-fairs is that they can be very crowded and have really long lines, so be patient even if the line is out the door. You are the gem, the job fair is the setting.

Job fairs are very useful. A company will usually not hold or participate a job-fair unless they have an acute need for candidates.

A job-fair is probably the 2nd best way of landing a job, after personal recommendation based upon networking.

Don't try to squeeze in a job fair into your lunch hour. Block off at least three or four hours minimum.