From what I have seen discussed in other threads, on other forums, you can most likely expect not to see a reptile show in TN. This is due to the very restrictive laws reguarding the sale of native colubrids (and geckos), which inlcude a permit (I think the permit was about 200.00). Also, the laws do not specify the subspecies, only general species. So what you end up with is that if you want to sell a king or corn snake, no matter where the particular subspecies in from geographically, you need a permit.
If you are wanting to go to a show, AL, KY, or NC would be your best bet.
John