Cloning an Event creates a duplicate copy. You can diagram in the new copy without affecting the original. Clone an Event from your ST Home, click the Clone button on the right side of the Event card.
Adjust the Name of the Cloned Event, if necessary, and then click the blue checkmark to Clone!
The new Event will automatically pop-up in a new browser tab. If the copied Event does not appear after clicking the Clone button, it may be affected by your browser's pop-up blocker. Refer to the articles on pop-up blocking from the Google Support page or the Mozilla Support page for more information how to adjust those settings. If you're having an issue Cloning an Event that is unrelated to a pop-up blocker, Contact Support at the bottom of the Help Center.