In my experience, and that was mid to late September, the people in the campsites that want to move to a better site get first dibs in the very early morning. The owner of a first come first serve site is approached and asked if they are leaving. If they say yes, run to the ticket booth and grab the site, put your paper on it, and you win. Campsite gates usually open at 7, but the insider trading is done by then. Getting into the overflow can help secure a camp site in the morning before the gate opens. Once the gate opens, you have to find the open site first, then park and get to the ticket booth and get your paper on it. It's tricky business.
