I attended the four hour Drawing Performance by David Kassan Friday night. I thought you all might be interested in how it was set up - so I posted a photograph here. It was very easy to see - the model was on a stand with a bright light David had his back to us and worked on an easel. There was a camcorder that was recording the artwork and projecting it on a large screen behind the model.
David was quite entertaining and the four hours went by very quickly. It was quite fun and would definitely recommend it.