1. Have some resumes handy (although many will say "go online to submit resume")
2. Dress in a presentable manner - You don't necessarily have to wear a suit, many do, but at least shirt/tie to look professional.
3. If it's anything like the expos I went to (UT austin), there's going to be tons of people, long lines, and tons of freebies. Be prepared to be very tired.
4. Try to research the companies ahead of time so you know a little bit about them. Try to go early as well as towards the end, most of the recruiters will have heard the same stuff over and over again.
5. Good luck! I hated the expos...such a waste of time for me
