There;s an annual event in January at Treasure Island, near Tampa. I've been to it a few times, though I missed last two years.
There's also the Kite Trade Association annual trade show, which I think will be in Clearwater this winter. If it is, the indoor business part of the show is not open to the public, but I may be out on the beach flying demos of the company I work with's product, as other folks will be doing with their product.
There are a few events on the East COast as well, but I am not sure off the top of my head where of when.
If you are interested, check ou the America Kitefliers Association site at
www.aka.kite.org -- there is a link at the top of the page to the event calendar. Checking in every month or so should spot nearby events...