Copy a past event
Start the next night from the last one, and which past events you can open.
Step 1: Events → "New event" → pick a past event
The picker lists your previous events. Choose one and the editor opens with its content, links and reward filled in.
Step 2: Set the new dates
The event date and the posts are cleared on purpose, so the copy cannot be published until you set them. Everything else carries over. Check the ticket link, it usually changes.
Step 3: Publish
The copy is a new draft. The original and its stats stay untouched.
"Duplicate" on a running event
The event page also has Manage → Duplicate, which does the same from an event that is still open. Useful when the brief has locked and you need a variant.
Which past events open
The picker offers your last ten events. Under Events, the Free package opens the newest past event in full; older ones are listed but their detail pages are locked.