We encountered a similar situation in a Wyoming campground many years ago.
Our church group had the group campsite reserved until 12 noon.
At about 1030, the "Wagon Master" from the Good Sam group that had the group site reserved for the next couple of days came to our pastor and asked that we get out as soon as possible so they could move in and get set up for their rally.
Our pastor was willing (although pretty upset about the whole thing), but many of us were not. We were one of the last to get loaded up and move on, at about 1155. We waved and smiled at the "wagon master" as we left.
This all happened about 20 years ago, so you see it is nothing new, nor is it limited to any area of the country.