Looking at the website  mackeeauctions.com   they look at have about 15 race cars  with a number of classic cars and exotics.  Small auction   35 vehicles is stated     starts at 3PM at the track   I called and they say its a free to attend event   :D  bit of a drive for some   but the 5 km tack i hear is amazing.   worth the look ...  8-)  viewing at the track is at 1:30 pm to start.   they have a demo day and lapping day that day so should be a good day to check it out ...   there members include   Jaques Villieneauve  Trevor Seibert and others.  Scott Hargrove ( Porsche GT1 driver) was teaching up there and posted some impressive driving on the track on utube.