Yes, it shouldn’t be necessary, but as one side starts to use it then so will others in order to compete for ear space. In others cases, it becomes necessary if there are too many outdoor amplified music stages drowning out the dances; generally the stages are more discreet than at the likes of Faversham Hop Festival where Morris is ousted by the proliferation of pub rock bands playing outdoors, but then that technically is no longer a folk festival.