I think this is a great idea!
What gave me the confidence to speak in front of a large group is having spoken at a Toastmasters group of 15 people. I practiced a total of 10 speeches in front of them over the course of a year and a half and got feedback from them as to how I could improve. This helped me a lot and I feel there are ways I can still prove.
Alf, you are spot on about the feedback and limiting the size of this workshop to a few people. I would attend such an event. Depending on when it is held I could also pass along what I learned from Toastmasters to those who attend. I too am still learning how to incorporate everything I have learned when I speak in front of an audience. Like any kind of skill, it takes deliberate, frequent practice.
Mieczysław Daniel DybaMobile: (323)[masked]