Just a thought.
You termed the visit by your Artist in Residence as an interruption.
Maybe if you want some continuity with your lesson, you could clue the
visiting artist in on what you are doing in advance.
Maybe you could perceive the visit as a compliment to Your program.
But youcalled the service an Interruption.
Why do art teachers consider the Artists in Residence as a negative?
It sounds like a playground mentality.