I was fortunate enough to run a folk festival for seven years at the Museum where I worked. We had an operating farm and a big Nature-themed children's playground, as well as a lake and plenty of area to run around and picnic. We charged half price for kids under 12, with kids under five admitted free. On top of all that there was to do on a normal day, we did music and art workshops for the kids, so they had a ball. If people wonder why the coming generations don't embrace folk music the way that we have, they're not even going to hear it if we price them out of the market (price their parents out of bringing them, and not even coming, themselves.)
Jerry