Margie Markham (middle) strums on her banjo alongside Fred Parnell (left) and Graycyn Markham (right) during Saturday’s Founder’s Day festival. (MORGAN MCMULLEN/Lake City Reporter)
The Lindy Hop and centuries-old agricultural equipment showing up in the same time period may be cause for concern among time travelers. But when both — along with decades worth of other historical ar…