I did go to a workshop one year at Witney on Irish ornamentation for all systems which was run by Luke Daniels on the Anglo. It was interesting and gave space to experiment but he obviously could not explain how to do it on an English.
The "playing by ear" workshop I mentioned above was with Norman Chalmers (Jock Tamson's Bairn fame) and used Scottsh music but it was extremely useful in the way it concentrated on Rhythm. So whichever system you play you can get something out of the right workshop.
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sj