You can duplicates events in the Events module (at Global level) -> Events list. Click the Actions menu of the event to be duplicated and select "Duplicate".
A popup window will appear in which you will be able to enter the name and dates of the duplicated event as well as the team(s) connected to it.
Additionally, you can choose which sections and modules you want to duplicate from the existing to the new event. Confirm by clicking the "Add event" button.