My first trip across the ditch to Pukekohe was in January 2008 for the Tasman Revival as it was then.
It was a mix of historic and modern racing and the one thing I did notice was there were a lot of BMW's there competing both in a controlled class and an open class.
Perhaps having a Tribute to BMW meant the promoters could be guaranteed good grids which also means good entry fees being paid. It sure helps when balancing the books at the end of the day.