It happened on three separate occasions.

这事在三个不同的场合发生过。

《牛津词典》

It happened on my way to play.

它发生在我出去玩的路上。

youdao

It happened on the Yangtze River in Hubei Province on the night of June 1st.

它6月1日晚发生在湖北省长江上。

youdao

This time,it happened while he was working on a railroad with men who did rough work and looked rough.

VOA: special.2010.08.01

I find that every time we do our meditation on Thursday, I'm always running to make it, or something happened before I get there, I'm like "Oh my God, meditation!"

我发现每次我们周四,要冥想时，我总是匆匆赶过去，或者是到达之前发生一点事故，我就好像“天哪，要冥想！“

普林斯顿公开课 - 人性课程节选

exactly what happened and how that happened and I wrote the whole article on it.

具体发生了什么，怎么发生的，我写了一整篇文章。

研究美国经济 - SpeakingMax英语口语达人

It happened on a cold, rainy night in Georgia when I heard " West of Rome" (audio).

NPR: The Best Living Songwriters

It happened on the northbound carriageway, south of Fordoun, at 16:11 on Friday.

BBC: Appeal after two died and two injured in A90 crash

There were conflicting reports as to whether it happened on Saturday or Sunday.

BBC: Libya Coptic church blast kills two Egyptians