I found the teacher makes a difference in the behavior, attitude and responsiveness of the students. This teacher circulated among his various tour groups, and when he would pop in on my tour, I would ask him to be a docent and ask the students a question about the artwork on view. The kids enjoyed seeing their teacher participate and we had some fun discussions.
I think you would need to judge if this would work in your particular circumstance.

What a great idea!
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What a great idea, Annette!
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