Then there is the question of defining folk music.It is such a broad term that festival organisers must have a hell of a time determining who fits the bill and who does not.
Smaller festivals too, must have a hard time attempting to increase performer setups, performances and pulldown times. When you only have 2 or 3 venues it is a real crowd killer to have one "out of action" for 30 mins while the next group sets-up.
Very difficult situation.