I wouldn't even bother to check the piano. They don't have any money in those places and probably can't do anything about it anyway. However, here is a difference between an assisted living facility (they have money) and a retirement (nursing) home (they don't).

These folks are going to love anything people play. I'm sure none of them are expecting concert level performances. It's good practice for every body and you make people happy at the same time. smile

Last time my kiddies played in a retirement home, there was a stuck key. It was horrible for the kids, but they all learned how to play around it. That is a helpful lesson that they wouldn't have gotten any other way. The students handled it well, and no one in the audience even seemed to have noticed.
It is better to be kind than to be right.

Professional private piano teacher since 1994.