You can't currently delete events right now, but you can recycle them for a different use by changing the name and settings... or you can archive the event:
To archive an Event:
Open the event and click the arrow in the top right. Then you can click "Archive Event".
The Event will be remove it from your event list.
To see archived Events and/or restore an event:
Go the your Event list and click on "show archive" below your event list. From there you can click "restore" on any event that you want to restore to your regular event list.