Elvin Bishop appeared at the National Guitar Workshop in Austin speaking about his introduction to the blues in Chicago. He also played several blues songs with his guitar player Mike Shermer and with members of the NGW faculty and students. Of all the guest artists I've seen present at NGW, this was by far the most interesting and lively.
I've posted some videos on YouTube including a jam where Elvin brought up several young students from the NGW class. Very cool!