Thought I'd mention that if it is possible to incorporate this feature, an excellent list can be found by googling "Australia racetrack grading". (Not sure I'm allowed to post a direct link?). Very handy for differentiating provincial and country meetings.

Also, if even a metrop/non-metrop variable is added, I would strongly suggest classifying Darwin, Hobart and Launceston separately from other metropolitan meetings, even though they are officially "metrop" venues.