Additional info; saw this in a program forum:
“Some of you may have received an e-mail from the Rock Hall Lodging Assoc. that your campsite was cancelled as the town has now decided not to support a campground next to the race site. Just so you know, there is a campground 3 miles away that is renting for $57/night (2 night min). I called yesterday and got switched over since there is nothing available at any inns/airbnb/etc. Hope this helps!