I've done a few of these recently, and several of us agree that the biggest mistake to make is to underestimate the intelligence of people who are stuck in nursing homes. Apparently some people go in and sing them the most inane 'music-for-five-year-olds' gibberish, whereas of course these people have seen a lot and know a lot. If you respect their intelligence, you'll find they really are satisfying and appreciative audiences.I've just re-read that last sentence and wonder if it sounds pompous instead of helpful... wasn't meant to be.
Hope it goes very well. - IanB