If you dance, of course, you can't do modern belly dancing or something like that. Folk dance is good!
Musical instruments are also ok, as long as you can take them out at that time!
If you sing, don't pop songs. You know, old people are generally very conservative and don't sing songs related to children. It's hard for you to touch the sadness of the old people and make them unhappy. Ethnic groups, hometown songs, anti-Japanese war, or sisterhood can be done! The older the singer, the better!
I recommend several songs: Water Town in Dream, Du Shiniang, The Sound of the Waves Still, Flowers Blooming in Shandandan, Congratulations on Making a Rich Life, Sailors, Stars, Sweetness, Childhood, Watching Flowers in the Fog and so on. Any capital is an old song with a high degree of singing. Choose one according to your timbre. Nursing homes offer condolences to the elderly. How kind of you! Good luck!