I hope the ads go far beyond workamping.
How about some of the vendors that attend shows giving their experiences. Alibaba has a plethora of items that most vendors buy in bulk and sell at these shows. If some ex-vendors can give their experiences - item, source, cost, mark-up, booth costs, expenses, quantity sold at typical show, good & bad venues, etc it would be an invaluable resource and allow others to start up their own business.
How about existing vendors needing booth attendants?
How about existing vendors franchising what they've found successful?