Pleased to say there is a way to add a group of People who attended a historic session to a future one 


Go to Activities Tab


Manage Session Registers


Find the session you are wanting to move people into 




Click Search by Session 


Select Historic or Future (datewise) and then the Venue and Session that have your people in


Click Search - this will show you the people who had attended the Historic session - you can either select them individually or click All to bring all of them into the new session 




Click Add To Register