Tradeshows are often most valuable, because you’re reaching people who are there specific to meet you. I recommend check out this article from Inc on great event marketing ideas. No matter how you set up your booth, I recommend running a giveaway to help you collect business cards. Your event staff can only talk to so many people at once. When the tradeshow floor gets really busy, having a box or bowl for people to drop their cards to win a prize is a great option, because in a busy environment, most people won’t wait.