Peergrade can by integrated with your CampusNet account.
When it is time to add participants to your course, there will be an option to import from CampusNet. After logging into your CampusNet account you can select the course(s) for which you want to import the student list. Whenever new students are added you will need to import the student list again and this will import only the students that have been added since the last time you imported the student list.
It is important to note that if a student is removed from your class on CampusNet, they will not be removed from the course on Peergrade. To remove a student go to your Paricipants list, click on the grey pencil to edit the student and then click the red trash bin to officially remove the student from the course.