Go for it, Skip. I know noone who travels further to sessions than you (though they do say it's only to get out of this 'pissant swamp' for a few hours), and you so clearly love the tradition. It's always a pleasure to be at a session with you, I'm sure few would begrudge a few coppers for leading a workshop. And there most certainly ARE plenty of people - young and old - who just don't think they would be good enough to join in at a session. If you can allay those fears you will be doing a good job in bringing new instruments and voices into the circle.