There is folk club (singing) at the Crabshell Inn, Kingsbridge on a Thurs Night, There is a more musicky session with some singing every Wednesday in Galmpton near Kingsbridge and there is an Irish Sesh on Tuesday nights in the Kingsbridge Inn in Totnes. Galmpton usually does it's own little folk fest between Sidmouth and Dartmoor Festival dates.

Hope that's helpful

Sarah