Sean,
There is supposed to be a "list" somewhere, but it seems like there have been some problems with that system lately. I'll talk with Sheri (track scheudling manager) and make sure that we have you on the approved list.
Pretty soon Chicane Trackdays will have all the things a good trackday org should have. A curriculum for teaching new students, and a card or certificate that you get at the end of such training proving that you completed and passed. Maybe, just maybe a website.
Have fun out there!
Scott