memorial day; commemoration day; anniversary
A day set aside to remember or celebrate a person, event, or achievement. Can refer to personal anniversaries as well as official commemorative days.
今日は二人の結婚記念日です。
Today is our wedding anniversary.
In that town, they celebrate Independence Day every autumn.
The couple celebrated their wedding anniversary.
Next month the company will reach its 50th founding anniversary.
He had completely forgotten their wedding anniversary.
I booked a special dinner for our anniversary.
wedding anniversary
school founding anniversary
anniversary of the Great Kanto earthquake