The short answer
Book a stall, design the display around one clear product story, and staff it with people who can answer technical questions.
Exhibitor packages usually include floor area, basic structure and listing in the event directory. The difference between a busy stall and an empty one is a single legible idea plus samples people can touch.
Staff the stand with someone who can answer specification and installation questions. Visitors at design fairs are often deciding what to specify, not browsing.
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