Getting to Compass Cup (cow race) Sat 24th

I was intending to go to the Compass Cup tomorrow. BUT, the Tour Down Under seems to be smack in the middle, with road blocks everywhere, I'm sure. Any suggestions of how to get to Mount Compass from Adelaide, but avoiding Willunga/McLaren Flat etc?
Also, any information about when it starts etc? I tried to d/l the .pdf at
http://www.compasscup.com.au/
but can't seem to get it to open....
Also, any information about when it starts etc? I tried to d/l the .pdf at
http://www.compasscup.com.au/
but can't seem to get it to open....