Welcome to the Forums Kyle. You will enjoy the Breyerfest. Is this being held at the Kentucky Horse Park in Lexington? Neat place. I hear the camping area is nice but we have never camped there.
Reference Nashville, we liked the campgrounds on Music Valley Road. There is a KOA, Jellystone, (I believe) and another one that is also nice. You are close to restaurants within walking distance and if you should need anything, there is a Camping World on the same street. Downtown is nice. The DW and I have been to the open air market twice and liked it both times. They have a food court where you can get food from different countries.
Have a Great Time.
Dan