BTW, Barbara, you bring up an important issue:

Nursing homes and rehab centers often have a mix of the cognitively impaired and the physically impaired (some of whose impairments are temporary, as with rehab following a broken neck or knee surgery). The same goes for assisted living facilities, whose populations include people with short-term memory deficits and others with no cognitive impairment but who need help with bathing or dressing for physical reasons.

This can pose real challenges, since the needs and expectations of the various residents can be quite diverse.

I think this sort of diversity within an audience is probably greater than what musicians find in a typical concert or pub or folk festival.