Similar alternative, close to what was suggested for expenses in #3686: have a dropdown in the event creation form to select another event to use as a template.

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I would love this feature as well, We have regular yearly events that are very similar. Things do change year to year but being able to create either a template or a clone feature would be great.

Particularly when relating to tickets/tiers/donations etc.

Yes, this would be a very handy and time saving feature for me. I organise a fortnightly film and food event and most of the core details and ticket details are exactly the same every time. It would save me lots of time to not have to re-create the exact same tickets every single time.

We're currently implementing a feature for OCF collectives to duplicate their existing profile elsewhere. We'll be able to re-use this API to implement a "Duplicate event" functionality; we just need to figure out where in the interface to put it.