Some changes cannot be made to your Event while it is Live. You’re always able to unpublish your Event if you need to make specific changes that are unavailable, though it will be inaccessible to registrants until you make it Live again.
There are two ways to access the Edit abilities of an event that is Live.
The first way is to:
Alternatively you can get to the edit screen by doing the following
While the event is live, you may add or modify tickets. You may also add or modify add-ons. You may also click on Customize to change any of the web page set up.
To make other changes to a live event, you must first unpublish the event. To unpublish, go to the Launch tab, and click the Unpublish button. Your event is now considered a Draft.
Once your event is unpublished, you can make any changes within the Details, Registration or Customize tabs.