You can configure your assignments to include a peer review. Peer review can be assigned manually or automatically, and the number of required reviews can be modified.
Directions for Assigning and Viewing Peer Reviews and Activity
Important Notes about Peer Reviews
Peer Reviews are ungraded by default
In Canvas, peer review assignments themselves are ungraded by default; however, you can create a graded category in your Assignments area should you wish to award credit for student peer review work.
Student Access to Peer Reviews
Peer reviews are available from the the Due Date of the given assignment and no earlier. Students cannot complete a peer review until they have submitted their assignment and the Due Date has passed.