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The probability of event A occurring given event B has occurred is an example of conditional probability.
The probability based on an event that has already occurred is 100%. If the event has occurred, it has occurred.
The Vietnam War is the event that occurred in the Tonkin Gulf.
The constitutional convention occurred second.
No memorable space event occurred on this day.
What important event occurred April 9th, 1865
What important event occurred April 14th, 1865
If you are talking about probability, it's the occurrence an outcome that has occurred. For example, an Ace of Hearts is drawn out from a 52 card deck. In reality, an event is something that you have witnessed. For example, I saw airplanes crash into the World Trade Center on 9/11.
Flashback
The narrator ran
The constitutional convention occurred second.
nothing