Just one thing to keep the pedants happy.

Folksingers are dead. All that is left are folksong singers. And not many of them. The rest perform contemporary acoustic music. Those who write and perform all (or almost all) their own stuff are the singer songwriters.

For a nice evening you need a mix - much as it grieves me to admit the contemporary stuff has virtue. But there is no such thing as a forgettable folk song. If a folk song was forgettable, it got forgotten. Until some of the contemporary ones have got forgotten, we'll have to put up with them to hear the ones which won't get forgotten. I wish someone else could forget them for me.