Mistake #1: Chairs for booth attendants
It sends the wrong message—to the person approaching AND the folks working the booth. You don't want the potential customer to feel as if they're putting someone out to get up & take care of them. Staff will get the wrong idea about the reason they're there. Plus, it's human to get comfortable, get involved in a conversation and lose track of working the booth.

Getting a trade show booth set up is a daunting prospect. Something almost always gets forgotten, from the technical, to the trivial, to the big-picture conceptual. Quantum put together a list of things people forget when getting ready for a show, and I'm going to present them in segments, in no particular order. Here's the first 6: