For the record: Evenium is not the owner of the database you implement (we are the host only). It must be the organizer of the event who can delete it. 

Go under the  “Configuration” / ‘General information” tab

Once you are on this page, you can delete your event by clicking on (bottom left)

CAUTION: Once the event is deleted, there is no way to get it back. This action is irreversible.

Remarks: Deleting an event will automatically delete the guests list, the website, the registration form, the emails and the related options’ information. 

If you want to keep an example of the website, registration form and emails of an event, we invite you to duplicate it before deleting it.