This year’s annual Thanksgiving Eve Interfaith Community Service will be hosted by the Unitarian Universalist Congregational Society of Westborough at 64 West Main St. It is organized by the Westborough Interfaith Clergy Association, which encourages all area residents to join the community celebration and give thanks. There will be two open rehearsals at the UU congregation’s chapel for residents interested in singing with the choir at the service: Sunday at 4 p.m., and Wednesday at 6:30 p.m.  The service will begin at 7:30 p.m. Wednesday, and will feature a variety of musical performances in addition to the choir. A reception will follow the service; participants are asked to bring a dessert to share.