Hi,
gigs in a Christian nursing home are not completely different to gigs in non Christian nursing homes.
Maybe it could be a difference, that songs working fine in non Christian homes, may not please the event manager in Christian homes.
Once at a Christmas event, I‘m asked to play songs like "For he's a jolly good fellow", Polkas & co!!!!
Could be and maybe work in non Christian homes, but in Christian homes the meaning of Christmas is very important.
At Christmas events, usually I play Christmas carols like "Silent Night", winter pop songs like "Jingle Bells"/ "Rudolph the red nosed..." and softer pop - and it works everywhere.
The best way is to ask the event manager about songs, you may not play.
So some songs or some bands are unwanted in Christian cycles and may not satisfy the event managers.
Sometimes not reasonable, but you are serving and you have to respect the event managers requests, it's not a concert.
You remember about the topic, what songs to play in a Jewish Home?
It's a bit similar here, because it‘s a question of your sensibility.
At least, if the event is not a worship service or a evangelization, there is no need to play music with a Christian message. You're not hired to lead the audience to Christ.
With the popular gospel tunes, you may not be wrong, but other Christian songs may unknown.
For example, if you play ”Give Thanks“ the audience may think ”Should this be ’Go West‘ as ballad?“
But without Christian songs it's possible to touch the people‘s hearts and to make the people feeling better and you may be humble in the knowledge "My talent is a gift of God". I do it so and can serve without preaching the gospel. A Christian brick layer does not build church buildings only.
A happy new year!

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Regards
RF