Your customers are also the other exhibitors. This is not a normal show in which you sit at a booth and everyone comes to you. You must facilitate the networking by going out to your fellow exhibitors. Take a look at the exhibitor list and make sure that someone on your staff visits your targeted customers. Be open to the fact that other exhibitors and attendees will also try to market to you.
Trade shows normally discourage soliciting by non-exhibitors.
The purpose of the day is to sell. Market yourself, market your product, market your service. Take advantage of the seminars. Procedures are ever-changing and you will learn new details that might affect the way you do business with the government. Stay ahead of the game.