parents' day; classroom observation day
A school event where parents visit and observe their children's classes. Often held once or twice a year.
来週の金曜日は授業参観です。
Next Friday is parents' observation day.
授業参観で、子どもたちが発表をしました。
The children gave presentations during the classroom observation day.
I'm planning to go to my child's classroom observation day next week.
There's a classroom observation day this month.
Many parents attended the classroom observation day.