As far as the Exeter area goes there's the Seven Stars (folk club) at Kennford on Friday 24th. A little further afield, I see the Shammick Acoustic Sessions have a guest in Coombe Martin on Saturday with a day time workshop. On Sunday there's a singers' night at Topsham Folk Club or Mike Silver is on down at Folk on the Moor at Lee Mill. Most of the sessions I know of tend to be mid-week I'm afraid.