I never went to the singers club so I cannot talk from personal experience. It is well documented that Bob Dylan sang there in 1962, And I believe Seamus Ennis was booked there and that Tom Paley used to turn up there
In the early 1960s, Carthy visited Ewan MacColl's Ballads & Blues club to watch a friend, the singer Roy Guest. The main performer that night was Sam Larner.