Bonenkai (literally, forget-the-year party) is an annual event held at the end of the year by an organization or group to give those attending a chance to look back at the past year and show their appreciation for the hardships they have each endured, before forgetting the current year and committing themselves to making a fresh start in the upcoming year.
忘年会（ぼうねんかい）とは、組織や集団が一年の終わりにその一年間を振り返り、その間の苦労をねぎらい、忘れると共に新たな一年に向けて気持ちを新たにするために行われる年中行事である。