I did actually attend David Gibson's workshop (two half-days) last month. I did not receive much instructions or demonstration regarding operational side of street photography, e.g. how to set up your camera for maximum DOF or sneak close to your subject silently like a ninja, but he did point out some useful tips such as look out for half a picture and hang around for the other half to complete, or follow/stalk interesting subjects...etc.
The workshop wasn't as intensive or structured as I hoped, but it did contain useful and new information to me nevertheless.