Bob:
I'm not sure if this fits your criteria, but I thought it might. The article at the URL
given below is long and detailed, and talks about other places, such as Fort Seldon,
where popular culture becomes a part of the "history" of the place. I don't know if
"popular culture" has anything at all to do with "folk" culture, but maybe it does?
The description below comes courtesy of "Got CALICHE?" of July 24, which Anita
sometimes forwards to the list.
http://www.inlandempireonline.com/news/stories/072301/past23.shtml
National Park Service historians and others nationwide have suggested
recognizing the Gram Parsons legend in the context of the
counterculture era. Around the country, historic sites are updating
their official chronologies as they ask the question: When does the
past become history?