What late-night Christian church service is often held on New Year's Eve?

The late-night Christian church service often held on New Year’s Eve is a Watchnight service.

Watchnight services bring worshippers together near the end of the year for prayer, singing, preaching, confession, thanksgiving and, in some traditions, Holy Communion. The service may continue until midnight, when the congregation welcomes the new year in a religious setting.

The practice is found across several Christian traditions, including Methodist, Moravian, Baptist, Anglican, Lutheran, Catholic, Adventist and Reformed churches. John Wesley helped popularize watchnight worship among Methodists in the 18th century, especially as a service of reflection and covenant renewal.

It is sometimes called Watchnight Mass, Watchnight Vespers or a Watchnight Vigil. “Matins” and “Evensong” are also Christian services, but they are not the canonical name for this New Year’s Eve observance; Tenebrae is chiefly associated with Holy Week.