I know this may come as a shock, but sometimes professional development on workshop days are not as productive as they could be. I gave a speech to my grad school class about this exact topic. In order to improve on the current model of professional development, I believe we should adopt some of the ideas that I learned from going to Edcamp last spring. You can learn more about it at edcamp.org. I also made a short prezi to illustrate my ideas for adaptation.