You have made the perfect event and want to preserve the theme or structure to use for another event in the future. Say hello to Duplicate!
With Duplicate you can take an entire event and create a new event or even create a new Template for future use.
How-to
Select the Event you wish to Duplicate
Click on the Duplicate icon to the right of the Event
Select the Stage. This is where you can choose whether or not to make this a Template to use in the future.
Fill out all of the other necessary information, be sure to provide a unique name!
Click Save