Well I don't know if the Durham folk club is still going (it probably is as they organise th eDurham Folk Party each year) but I do know where you can find out. Monday nights at the Colpits pub there is a music session and the folks there will be able to point you in the right direction. The Colpits is a Sam Smiths pub on the road from the roundabout under the viaduct that leads to Neviles Cross can't remember the name of the street. 5 mins walk from the bus station. Kicks off about 9pm. And its a bloody good session.