I'm not too sure myself but I'm "assuming" that it will be O'Reillys anywhere in the state of Texas, as in the past. As soon as the info is released, I'm sure someone will post it.
You can purchase your tickets online now at www.midlandhcc.com. Go to the Mex-Tex tab and the link is towards the bottom of the page. Or you can purchase them at any O'Reilly's in Texas begining on 5/24.