Related Questions:
Create a copy of an Event
Copy an existing Event
Copy Menu Items into a new Event
Add Events to a Multi-Day Booking
Add multiple Events
Can an Event be recurring?
Procedure:
Find the Event you wish to Clone (through Events Tab, or through the Booking)
Click on the downward arrow on the right side of the Event
Select Clone
Associate with appropriate Booking
Select the Check boxes next to items you wish to copy over (Menu Items, Custom Fields)
Select relevant date (or dates!)
Select Clone
Additional Information:
Cloning Events within the same Booking does not check conflicts
Want to Clone Multiple Events at once? Check out this article!
Events cannot be recurring but Bookings can be recurring see instructions here