'Event' in the Bible

"And you will keep this event as a rule for you and for your children forever.

After this event, Jeroboam did not turn from his evil way, but he returned and [again] made priests for the high places of people from {all walks of life}. He filled his hand with all [his] desire and became [one of] the priests of the high places [himself].

A horrific event and something horrible has happened in the land.