There is plenty of money to be made in the trade show industry, but to succeed you must have a solid business plan from the start. Craft shows, sports memorabilia events, and fan conventions are just some of the ways you can capitalize on people's passions.
But trade show management is definitely not for the faint of heart. There is significant pressure involved with filling the floor with exhibitors, and it takes a savvy marketer to attract hundreds, if not thousands, of attendees.
Risks aside, trade shows can be quite profitable for entrepreneurs who have the right skills. Event planning experience is obviously helpful, but most of the money is made within marketing and accounting. If you're interested in learning more then you'll want to read this overview of trade show business plans.