I found out later that the one in Baltimore was the advanced workshop. I could still do it, but I really wanted to learn about the different strobes and modifiers, and how they would affect the lighting quality. Fortunately, Don was kind enough to give me and few others a “catch-up” session the day before. So it was more like a three-day workshop for me.
Check out Leo DJ's post on the Lighting Essentials Workshop in Baltimore, MD a few weeks ago. He has some great shots.