I attended two fairs, one about a year out from my mil retirement and one about 6 months out. Both times, I stood in line and talked to the guy that eventually ended up sitting across the table from me during my UPS interview. I'm not saying the fairs were the magic that made it all happen, but I was much more comfortable in the interview dealing with someone I already had spoken to a lot. He remembered me from the job fairs and I guess came away with a decent impression. I know it takes your time and money to attend, but in the grand scheme of things it certainly won't hurt your chances...it might even help.
B2P