Nick is correct,if I rang a club and saw the name Andy Caven,I know I would be getting Buddy Holly songs,and veery little trad material,if I saw the name Dick Miles,Iwould be getting thishttp://www.youtube.com/watch?v=4K4-2laAOkI&feature=channel_page ,and no Buddy Holly.
most folk clubs,have a contact,if they dont have an e mail.
so what is the problem,if it someone you know nothing about contact the organiser.
the great thing about folk clubs is that they encourage people to make their own music,instead of being passive,mind you the computer allows that too.
long live folk clubs,and long live you tube,the two can work together,you tube is a great way of improving technique and also learning new songs.