At the moment about once a year - at Sidmouth.
We did get very excited to discover a folk club within half an hour of our place in West Wales, but it turned out to be the direst, most poorly-arranged affair I've ever encountered, run by a control freak whose idea of a folk club was him sitting in front of a minuscule audience picking out bluegrass numbers with enough amplification and electrickery to satisfy Spinal Tap. Suggestions that more partiicipation from guests and floor singers were met with the tart response that "this is a performers' club, you know".
The sad thing is, this is the only 'folk club' within miles, so anyone coming across it without knowing what the real thing was like would risk being put off traditional music for life.