We have camped many times during Bike Week at a friend's property. During this period, campgrounds are either already full OR charge hefty rates with a minimum stay. This is their time to scoop in the dollars. I would try to avoid the area by staying further west as stated by the previous poster. IF you do get into a biker campground, expect NO, zero, NADA, peace and quiet. Bikers also rise early, warm those Harley's up and roar off to breakfast.
Good luck to ya!