Maybe you'd attract more youngsters if you stopped calling them Folk Clubs.
A whole bunch of us 17 year olds went to the dark haired Vic Smith's Folk Club in Lewes back in the late 60s; for some unaccountable reason it was deemed kind of cool...and some lovely girls used to attend too. Mind you, Lewes always had a political edge with the influx of academics based at Sussex University, which seemed to go very much hand in glove with folk music. I was introduced to the Lewes Arms by a school friend whose professor dad would play us Woodie Guthrie, Seeger plus Django...no escape really.