Many people with dementia can no longer attend religious services. This can bring a great source of comfort. Short car trips. See Christmas lights, flowers, seasonal changes. At this level the person has almost no understanding of the spoken word and is unable to speak coherently.
Attention span is very short.
In this stage of the disease people do not have the capacity to deal with anything but the simplest of tasks. Photo albums, family pictures, memory books. A gather of pictures from the persons past can help if any memory is still intact. Most people with late dementia still enjoy the visits of dogs, cats, and other small animal. Recordings of old music Cuddle animals or even a lifelike cuddly baby doll.