I just saw the schedule of events at Watkins Glen, and I see that many other car club/ brands sponsor driving events at the track, how would we go about doing the same?
It is expensive to sponsor and run this type of event. There are a few car clubs that will have events at Watkins Glen like this coming up, and I'll try to hunt down the links for them, but I believe both the Genesee Valley BMWCCA & the Boston BMWCCA have HPDE events at Watkins Glen, and they have always welcomed Mini participation.
The Genesee chapter of the BMWCCA conducts several driving schools at WG every year. One needs to be a member of the club to participate. The event is not limited to BMWs.
I think it would be somewhat difficult to arrange for an event there for a couple of reasons. As YMNY mentioned, there is the expense; plus the track is very heavily booked and it would be difficult to find any open times.