A good instructional design practice is to have a predictable module structure for students to follow throughout a course. Many courses use the calendar to clearly communicate deadlines to students, and must do so with consistent format.
Currently copying requires creating a calendar event, and copying content for each item. By adding a “copy” button, the effort to build a course will be greatly reduced. If this triggered a dialogue to state how many copies to make, it would be very simple to quickly build out a calendar structure.
Please help to flesh out this idea by discussing your particular use case in the comments.