Every Tuesday it's our school Open Day. On that day students' parents can go to our class to observe our class.

每个星期二是我们的学校开放日，在那天学生家长们可以来我们班里听课。

youdao

A week later, Sara and I attended an open day at Ted's school.

一周后，我和萨拉参加了泰德的学校的开放日。

《柯林斯英汉双解大词典》

My school is going to have an open day on the tenth of next month.

下个月10号我们学校将有一个开放日。

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He told MPs the government had made changes so no school which stayed open would be penalised if individual students could not make it to school on that day.

BBC: Snow shuts schools and hits travel

Open a new school, and it will be oversubscribed before opening day.

FORBES: 01.24.08, 6:38 PM ET