I'm hardly an expert, but I did help with two small musical shows at a home for Alzheimer's patients. A friend who is an RN said that the director loved seeing the patients alert and socializing. Usually, she said, they sit silent and hunkered over.

So it may be that anything that gets them alert is good, and interaction is better.

Do insist that some member of the staff be within calling distance. I remember a time when a man in a wheelchair suddenly backed it up, hitting the hand of a woman in another wheelchair. It hurt her, she lost her temper, and started upbraiding him, and there was nobody around to help out.