is it possible to Migrate existing appointments to new calendar

We currently have a Proof of Concept that went live under a user's own booking account. We need to change this to a more generic sounding account, so it doesnt tie up this users calendar. 

is it possible to migrate existing bookings to this new calendar, or what would be the tidiest way to migrate?

As it currently stands, I'm considering running these two calendars side by side, and change the lead time daily on each account to coincide with a single date when they no longer have to run side by side. Hopign there's a smarter way of doing this.