Christmas Eve
Specifically refers to the night of December 24th, often used in a festive or romantic context. Compare with クリスマスイブ, which is more common in everyday speech.
See also: クリスマスイブ
holy night
A more general or literary term for a sacred night, not limited to Christmas. Can be used in religious or poetic contexts.
The stillness of the holy night touches my heart.
Many people go to church on Christmas Eve.