I have seen both. Some festivals have great players who know how to teach, and more importantly, know how to show a group of various level players, what they need to do to teach themselves ... but I have seen festivals, where a festival organization's favorite volunteer is given a teaching workshop, and he is isn;t a good player, and worse does not know how to teach/inspire. This is a bad thing - good intentions aside, a teacher need sto know what he/she is talking about - and how to get that across to a wide variety of players. More festival organizers should take this job seriously.