One time I booked a concert for Doc at a college in Greensboro, so a few days before the concert I called the hall to make sure they we ready- and find out who was running the sound.
A student working there answered phone. I asked if the guitar concert was scheduled and who was running the sound, and when the sound check was.
She said, "O no- there's not a guitar concert scheduled that night."
I said, "What!$#@$%"
She said, "There's some medical lecture- by a Doctor Watson!"