In General there aren't evening activities in these facilities. Volunteering during these hours would be welcomed. Some great options could be an evening bible study or a book reading. Finding resources for these types of activities may seem tedious and that is why I am sharing these lists.
Bible Studies:
Bible studies need to be simple one day studies.
SPIRITUAL ELDERCARE - I highly recommend this site. There are printable PDF lessons specifically created for dementia right there ready to be used for free. Lessons come with discussion points and at times even props for demonstrations.
https://spiritualeldercare.com/church-services/bible-studies/
Story Reading:
CHICKEN SOUP FOR THE SOUL - Chicken Soup For the Soul has many amazing uplifting short story reads for free from there site. These stories are a great option because they are the perfect length for a reading in a short period of time, they are uplifting and appropriate for any age.
https://www.chickensoup.com/stories
READER'S DIGEST - As a kid i enjoyed reading the short stories in Reader's Digest