Weekend of May 8th through the 10th at the Fowlerville fairgrounds there will be the Thrifter Sisters Flea Market Vintage Camper and Glamping event.
https://www.facebook.com/events/955120884506355/
https://www.facebook.com/thriftersistersfleamarket
The second link has information on camping but they have virtually unlimited rustic (big mowed field) and a few electric/water or full hookup.
No idea what this event will be like but it is close, has flea market in the name, will have a music act so figure what the heck Cheryl and I will go check it out. Probably beats doing yard work and other chores.