Your Sprint is over. Your increment is “Done”, you have coded cleanly, your unit tests and integration tests are bright green, you are proud of your work. The Sprint Review is running smoothly. The Sprint Retrospective allows the team to find 1 or 2 areas of improvement without revolutionizing the world.
The Scrum Master is often expected to facilitate and animate every Scrum events. But, according to the Scrum Guide, the role of the Scrum Master regarding the different events is to ensure that the event takes place and that attendants understand its purpose.