i did a show and rented a popcorn machine, made tons of people come to my booth
10x10 is not big at all. i have a 10x10 pop up that i put up to display my banner. Here is a picture of me at the last show:
Business cards, flyers with your information, etc.
If you sell a product, have customers sign up for a raffle. That way you get their contact information even if they dont buy anything.