Midnight Mass
first liturgy of Christmastide that is celebrated on the night of Christmas Eve, traditionally beginning at midnight when Christmas Eve gives way to Christmas Day
en-US/ˈmɪdˌnaɪt ˈmæs/
en-GB/ˈmɪdnaɪt mæs/
first liturgy of Christmastide that is celebrated on the night of Christmas Eve, traditionally beginning at midnight when Christmas Eve gives way to Christmas Day