When Duplicating (Copying) an Event, the resulting URL has “-copy” added to it. When copying a copy, you end up with a url that looks like this:
While the URL is technically fine, you may consider it unprofessional. The good news is you can always edit the url (called a Permalink) during the duplication process.
Simply click the “Edit” button, delete the extra “-copy-copy” or type something else, then click OK.
If you type in a url that is the same as an existing one, the system will automatically add a number to the end. (see green box above)