I have a degree in Community Ministry from Geneva College. While there, I did extensive research about effectively ministering to the elderly. I discovered that social isolation leads to depression, but that isolation can be combated with active participation in religious activities during holiday celebrations. I found that anticipation and participation in yearly religious ceremonies heighten's the individual's sense of membership in the group.
According to research by E.L Idler and S.V. Kasl, "Ritual observances, too, could be more important for the elder; the repetitions of these ceremonies are sedimented in memory, building up a sense of continuity over the lifetime in weekly and yearly cycles. Religious group membership also protected Christians and Jews against mortality in the month before their respective holidays during a six-year period"
Idler, E.L., & Kasl, S.V. (1992) Religion, disability, depression and the timing of death. American Journal of Sociology, 97, (4), 1052-79.
For this reason, I encourage family members to bring their loved one to religious services and celebrations throughout the year!