Kindly follow the below-mentioned steps to change the location of your existing event :
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 ‘Event Location’ option, 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 to the list.