The BIG one - PWG show at the Tampa Hyatt. One thing I learned from last time - wear comfortable shoes and bring information labels! I'm putting name, address and email address.
My MOH suggested giving them a fake email, but I know they spend a lot of $ to have a booth at the show and some vendors might have good deals or discounts, so I set up a totally separate email account for the wedding so my personal email won't get slammed.