Review the artifacts the class created over the last 3 hours. There should now be the following displayed in the room:
A Build Your Own Scrum diagram from each team
4 Meeting posters explaining Who / When / Why for each of the meetings
3 Role posters describing each role
A timeline of Scrum Meetings
I generally move these artifacts to the same area of the room during the review. The class often refers back to the artifacts they created throughout the rest of my two-day course when they have questions about the content.