I agree with some of what Jack says. It does make sense to advertise to the local community and not just within folkie circles.

Many folk clubs are guilty of this including Edinburgh FC at different points over the years. The sticking up of posters and delivering hand outs is, of course, a much more arduous and time consuming job in the city although you hire agencies to this for you these days. However, this comes at a cost.
In a local community, however, I suggest this is much more manageable. I don't know how much of this happens in Jack's village. Things may have changed in recent years.

Most clubs now tend to concentrate on social media these days to spread the word but I've not noticed that much difference in attendances as result. Many of the audience who read the publicity online would be coming anyway whatever the method of publicity. Of course, the posts gets loads of views and "likes" from meaning well meaning and often "wonderful" people but most of them won't bother to attend in a million years.