To change the location of your existing event, you need to first edit the event. Follow the below steps with screenshots.
1) Select the Event you want to edit the location from Box Office.
2) Once you select the event, to the right of the screen you get the event detail page of that particular event. Click on the Edit button to make any changes to the event.
3) Go to the ‘Event Info’ page and go to ‘Venue Location’, here you can change location by selecting a location that already exists in the list. OR you can even add a new location by clicking on the ‘Add a Location’ if the location is not added in the list.