I went a couple years ago. Are you on the MCGT e-mail list? I think they mailed out or posted a list of schools ahead of time last year. There were a fair number of schools, but not all the school are specifically for GT kids. It's a great place to check out an overview of many schools. These school fairs are also heavy on the marketing and want your $$$ (either tuition or funding), so definitely plan on some follow up classroom visits!

We are homeschooling now and if we were to return to regular school I have a fairly good feel for what we'd look it more seriously.