Some did camp in the bowl, like Dead Duck. I have more photo evidence, but don't want to go to the hassle of uploading. I think turnout played a part in this strategic decision. Dead Duck showed the grit the of the midwestern deadhead by ignoring the elements and rollin' with the punches.
Dino & Lee Owen from lex dead cover band Born Cross Eyed along with a few other lexington folks including my wife started doing a JGB side group playing Lexington around January 2012.
They played the 2013 Jubilee as My Sister's & Brothers, then 2015, 2016, and 2017 Jubilee as Owsley County, as they morphed from JGB side group into doing originals and non jgb material.
They fizzled out as a group, but she still sings with Born Cross Eyed along with Lee and occasionally Dino on the rotating drum slot.
Here's a little sample from Jubilee 2013: