Hello Karl Kessler, 

Thank you for your purchase and apologies for replying late, we are not working on weekends. 

Unfortunately, there isn't an option to duplicate Events in Amelia with its current built-in features. The Events feature is newer than the Services feature and it doesn't have all the functionalities as the services feature does. I will add your request to our list so it can be considered for implementation in the future. 

At the moment, the only way is to edit the periods of the old events (to create new ones from the old ones by editing their dates/times) but you will still need to remove the attendees from that event. In this case, you won't have the old events available nowhere in Amelia. 

If you have any further questions or concerns feel free to ask,