Watchnight

Holonym: New Year's (holiday-time sense)

Source: wiktionary

Near-synonym: New Year's Eve (not identical to watchnight: New Year's Eve is the entire day before New Year's Day (or specifically its evening), whereas watchnight is the night that begins at sundown on New Year's Eve and ends with sunrise on New Year's Day)

Source: wiktionary

And there is one night in the year I have always observed – the good old Methodist vigil called Watch-night, popularly described as "seeing the old year out and the new year in." […] I have only been a Methodist once a year; and peculiar, accordingly, have my watch-night emotions been. There stands the old portico in —— street; can it be a year since I ascended those steps? These are the aisles, the columns, the pulpit, the recess with its inscriptions, the Christmas evergreens yet fresh over the Communion Table – silent preachers all, that seem to say: "You and I are a year older, friend; but we have seen more watch-nights than you, and are likely to see more yet;[…]["]

Source: wiktionary

This was the first watchnight meeting among the Methodists. The people met at half-past eight; the house was filled from end to end; and "we concluded the year," says [John] Wesley, "wrestling with God in prayer, and praising Him for the wonderful work which He had already wrought upon the earth."

Source: wiktionary