How about a workshop on songwriting techniques, or a demonstration workshop to explain the differences between the free reed instruments ( anglo & english concertinas, melodeons, accordeons, harmonicas), or a demonstration workshop to explain why any rational being would take up playing a banjo instead of putting it in a dumpster? People don't always know why they like to listen to things, and they do like to be able to appreciate the finer points of what they hear - demonstrations of the fancier stuff help this, but do not demand that they participate.