People like me and my camping buddies go out the week before the show and stake our claims in Scholler. We measure out our areas and tape them off. Each paid camping pass gets a 20x30 area to claim as yours for the duration of your stay. I bring a landscaper's rolling scale (rolling tape measure on a stick), map out our equivalent area, and then stake and tape it. After mowing the grass, we then set our campers and such, then head home for the longest work week in history.
You have the privilege of paying for the time you aren't there. But at least you have a spot. Beyond that, it's a "seek and ye shall find" event.