I just booked a spot for my 13 footer at the Fairgrounds last week when my earlier plans fell through. Right in town... Makes logistics to the start line easier. Seemed like there was still plenty of room if you don't need any hookups. They have bathrooms and showers there as well.
Have you looked at Melvern Lake. Located east of Emporia 20 mins. They have both state and federal campgrounds. I also might have an option in Lebo, also just east of Emporia, if you just need a place to plug in. maryebarker@yahoo.com Mary Davies