i did a weird gig about 18 months ago. this guy asked me to a gig for people at campsite.
of course they didn't know anything even vaguely folkie. but soon i was aware of everybody singing along to EVERYTHING.

When I looked they were all singing the words from their mobile phones. i told them the title and in two shakes of a lambs tail they had tracked down the lyrics on the internet. very skillful, i can't find things that quick.

perhaps that's the way o go. tell everyone to bring a mobile phone to your folk club.