In part, this was also due to external events beyond his control.

This time, he had no external events to drive his campaign.

Your worry is always triggered by some external event or happening.

They sometimes occur in response to an external event or when a person attempts to make a movement.

However, it was an external event that got things underway.

Throughout the film the external events are cut in juxtaposition with the family's story.

Time, Eddie had decided during this period, was in large part created by external events.

Others were caused by external events, like the oil price shocks in the 1970's.

But the principle holds true even when your story is more concerned with external events.

Or, in other words, says that "Nuclear site safety features should be kept up to date with current knowledge of potential external events".