We held “Bonenkai” (Year-end party) in December 11th.

“Bonenkai” is written in Japanese as “忘年会”.

“忘” means forgetting something.

“年” means year.

“会” means party.

A bonenkai is a drinking party where we begin to forget about the problems in this past year and look forward to the new year.

(Reference)

忘年会は英語で何と言うのでしょうか