An event or action that was meant to happen somewhere else can get diverted and end up somewhere new. For example, if a flight got diverted because of bad weather, it landed at a different airport.
When we talk about something getting diverted, we usually mean that it was supposed to go one way, but ended up going another. This happens all the time in transportation - flights, trains, even buses get diverted when there's traffic or construction on the road. But diversion can also happen with plans and actions. Let's say you were planning a party for Saturday night, but your friends got tired and decided to divert the celebration to Sunday afternoon instead. In both cases, something was meant to go one way, but ended up going another because of new circumstances or changes in plan.
To turn aside from a course.
Example: The workers diverted the stream away from the road.
That has been subject to diversion
