@bxb11 , I conducted a SpeedGrader/Turnitin and Rubrics/Outcomes training session in a computer lab for approximately 30 faculty members. My solution involves a considerable amount of manual work on the front end, but I've been able to use the setup numerous times since then.
I used Mailinator to create fake email addresses for 35 students. I then created Canvas accounts for each of the students, using Mailinator to accept the course invitation for each one, and I edited each account so that the user names were generic (e.g. Student01, Student 02,...) and gave every student the same password. I prepared 35 slips of paper, each of which had credentials for a single fake student.
Before the training session, I created some sample assignments (with simple rubrics attached) and quizzes in the course. On the day of the training session, I had every attendee write on a sign-in sheet the email address they were using to access their own Canvas account. I then passed out the slips with the fake students' credentials and told them to log in as those students and complete some assignments and quizzes. Clearly, procedure trumped content in this step of the process.
While they were doing that, I navigated to each of their accounts and added them as teachers to the course.
When they were done with that step, I had them log out and re-log in using their own credentials. They now had before them a course with approximately 90 assignments to grade as well as a somewhat populated Gradebook. I told the teachers to pick and grade any assignment submission except the one they had submitted (although they were free to navigate through the SpeedGrader to view all of the submissions). This allowed me to demonstrate using the SpeedGrader to grade with a rubric, accessing Turnitin originality reports and using GradeMark, and viewing the Gradebook.
It's important to note that if your school is populating its courses through SIS and has SSO enabled, participants must access the student portion of the exercise through the "back door" login; this allows you to bypass the SSO login. You can find your school's "back door" URL on the Admin | Authentication page.
As I said, this involves a considerable amount of preparation, none of which is automated...but I've been able to use those fake students, and that demo course, over and over again, especially when I have to simulate activities--such as groups--that require numerous students to be enrolled in a course.