Your exhibit at a trade show can have an impact on multiple audiences. First and most logical are the attendees who are walking the aisles. But what about the attendees who wanted to come and actually signed up for the event, but due to unforeseen reasons could not make it? And then there is a whole group who were not planning on attending, due to location, budget constraints, etc.
Multiple audiences are waiting to hear from you about the product and or services you are offering. Use the trade show function as a focal point to share news about your company.