I realize that "what is a folk club?" might be as contentious as "what is a folk song?". Nonetheless, I offer a little evidence from this side of the Atlantic. In Chicago, radio station WFMT's Midnight Special hosts live two-hour folk concerts on many Saturday nights, broadcasting their second hours and posting the playlists. Although some concerts feature singer-songwriters who perform (almost) entirely their own works, here are two recent examples of people who do sing more than a smidgen of traditional or other songwriters' work:

November 17, 2007
STEVE GILLETTE & CINDY MANGSEN
   1. Grapes on the Vine (Steve Gillette/Charles John Quarto)
   2. Sunrise (Cindy Mangsen)
   3. Odd Man Out (Lou & Peter Berryman)
   4. Irish tune medley (trad)
   5. When the First Leaves Fall (Steve Gillette)
   6. Rudy's Big Adventure (Cindy Mangsen)
   7. Hurricane (Steve Gillette)
   8. Corinne (trad)
   9. Homelessness (Lou & Peter Berryman)
10. Rocky Road (Steve Gillette Dennis Dougherty David Kleiner)
11. La Guitarra (Steve Gillette/Frederico Garcia Lorca)
12. Song for Gamble (Steve Gillette/Charles John Quarto)
13. The Old Trail (Steve Gillette/Charles John Quarto)

January 26, 2008
DEBRA COWAN
   1. Cole Younger (trad)
   2. Isabella Gunn (Eileen McGann)
   3. Walloping Window Blind (trad/Charles Carroll Leena Bourne Fish, PD)
   4. Star in the East (Brightest and Best) (trad)
   5. My Boy Jack (Peter Bellamy / Rudyard Kipling) /
      The Widowmaker (John Connolly)
   6. Dreadnaught Mutiny (Jerry Bryant)
   7. Carpal Tunnel (John O'Connor)
   8. Has He Got a Friend for Me (Richard Thompson)
   9. The Rainbow (trad)
10. Medicine Wheel (Kate Wolf)
11. Darkest Hour (Carter Stanley)