Shows can sometimes be plagued by thieves. Before you open, make sure no valuable products are in any way out of your view. If you can, it's a good idea to have an assistant help customers while you ring them up, this other person is also another set of eyes.
I've found that many suspicious characters will turn and leave if you give them a friendly greeting and make eye contact. Make sure to greet everyone that approaches, this discourages shoplifters (because they aren't under your radar) and encourages others to buy. Also, be aware of people carrying large open tote bags.
Don't be afraid to take time at the end of the day to rearrange for the next day (if you have more than one) we got many repeat customers because the second day we rearranged our booth to have different products visible.
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