Peer Reviewings or Workshops can be supported organizationally by the activity “Workshop”.

Anleitung: Peer Review mit dem Workshop-Modul abbilden (PDF)

More:

• Using workshop [moodle.org)
• "Peer Assessment" as a method - stumbling blocks, advantages and disadvantages (e-teaching.org)
• https://moodle.jade-hs.de/moodle/course/view.php?id=4692 "Peer Reviewing" - Moodle sample course at Jade HS (login required)