last meeting of the year/term; year-end gathering
Refers to the final formal meeting or party of a year, term, or other period, especially in companies, clubs, or schools. Often implies a celebratory or closing event.
Today we have the company's year-end meeting, so I can go home a little early.
After the year-end gathering, we all went to an izakaya.
last trading day of the year; year-end closing session
Compound of 納 (settle, put away) and 会 (meeting), literally 'closing meeting'.