Tradeshow meetings, which should be happening more frequently in Florida than other states (so that's to your advantage). American Nurseryman and Nursery Management are two professional journals that advertise meetings. Also, contact the University of Florida Horticulture Department and do an online search for meetings relating to the type of plants that you sell (e.g. if tropical indoor plants, there may be a specific North American group).
Steve recommends the following next steps: