I had a quick look at a map and it's about 8km to the track.
At Oschersleben it's roughly 4.5km / 40 mins, so I'm looking at a 90 min walk. No problem for me as I like a good ol' walk and it gives me time to pick up something to eat on the way.
That said, of course I wouldn't mind a taxi service

, but I don't want to complicate your own plans plus I already feel like a dirty leech for borrowing Pete's tent.
EDIT: Just found a place that offers free tickets. Go to
legendsspirit.com and fill in your details in the formular. You'll receive a mail which when printed out will get you a ticket (paddock included) in exchange on Sunday.