Maybe just courtesy, spontaneity and an awareness of the situation might sum it all up- the 'folk police' seem to have seriously reduced in numbers, or maybe they just mutter nowadays?

This thread set me wondering when the jazz term 'session' came into use in the folk world? In the mid 60s the moveable feast which was the Marsden Rattlers always used the term for impromptu 'trad' (our definition) musical gathering as in 'fancy a session on Saturday? but none of us had a jazz background??
    Any thoughts?