Jim,
With all of the myriad means of communication we now have at our fingertips, it is normally a simple job to find out what sort of a club we are considering visiting before we go. Like you in the past, when I was more likely to wander around the country, I have sometimes been disappointed at the fare on offer in some folk clubs, but now I can look in a magazine and see a list of booked artists or what a particular club policy is. Many clubs already have their own website or advertise online in other ways. If not if I Google a club the likelihood is that somebody in the vicinity has discussed it online recently. The same goes for festivals and other folk events.

People like BH organising a (folk) event want as many bums on seats as poss to make the event viable. This side of the Irish Sea at least the best word that describes said event, if it includes at least half trad and trad style folk, is 'Folk'. There's no getting away from it without writing an essay to advertise.