Normally, it's not done on tracks. It's almost alway temperary courses set up on large parking lots or airport runways.
These links should give you a place to start. Good luck! <img src="#/f/iB_html/non-cgi/emoticons/thumbs-up.gif" border="0" valign="absmiddle" alt=':thumbsup:'>
SouthWest Division Region Locator
Texas SCCA
Houston Area SCCA