A wait for event activity is used to cease activity within a workflow until a specific event occurs. In many respects, a wait for event can be thought of as a trigger inserted mid-stream within a workflow; indeed, each wait for event is associated either with a manual or a scheduled trigger.
When a workflow containing a wait for event configured with a manual trigger is run, upon reaching the wait for event, execution ceases until the trigger is fired manually.
When a workflow containing a wait for event configured with a scheduled trigger is run, upon reaching the wait for event, execution ceases until the scheduled trigger’s configured date and time are reached.
Note that you cannot place a wait for event downstream from an interactive activity.