I'd be happy to come and sing a couple of songs, ask oaklet if I'm good enough. I'm one of the south Humber mob, friend of Karen & Colin, Oaklet, Skipjack et al.
Any more folk music in the area is good, I particularly like sessions, so the last hour idea is a good one. If you are short on spotlighters, you can extend it back through the evening. Please, however, no singarounds! Dull, dull, dull. All fat blokes in glasses droning on (no, nothing like me) or Norma Waterson manqué lady singers. Good luck from the north of the county.