Open the event actions by:
Right-click the event from the Planner Calendar
Click on the three dots labeled More options next to the event in the Planner side-panel (not available for Smart 1:1)
Select the option of how long to push the event to the future.
Note: Reschedule using Task actions from a Task Policy will provide options for the upcoming Task Event. Rescheduling from a Task Event will reschedule the Task Event where you selected the rescheduling option.
Refer to Remove scheduling exceptions from the Planner to clear undo any scheduling exceptions.