You could hire out Freight Island from midday to 5pm both days relatively cheaply i would guess, the people attending would be drinking and eating so the various franchises would be taking more or less the same amount over the counter as any other friday or saturday. Have the rider draw there, a few bands/DJ's plus a few sideshows and competitions for the fans. It's a winner for me. The idea of putting the GP on screens around the city, if it's not being done then that should be one of the first questions for the organisers.