"中秋节定于每年的阴历八月十五日"译成英语是什么?

Mid-autumn Festival is set/celebrated on lunar August 15th every year.

be scheduled for更多用于待执行的事项
该选举定于9月举行。
That vote is scheduled for September.

而中秋节是已经定型的，用set/celebrate好点吧。
每年都有的节日，不该用过去时，应该用一般现在时。

"中秋节定于每年的阴历八月十五日"译成英语是什么?

"Mid-Autumn Festival is scheduled for August 15 lunar calendar every year"

Mid-autumn Festival is set/celebrated on lunar August 15th every year

Mid-autumn Festival was celebrated at every lunar August 15th.