I went to ScrumMaster training a few weeks into my first job in an Agile project management environment. I was brand new to the methodology, and throughout the training and after, I didn't really understand the value of the ScrumMaster. “What an easy gig,” I thought. Even a year into practicing the methodology (as a member of the team, not the ScrumMaster) this was my understanding of the responsibilities:
Calendar: Schedule and start the Scrum ceremonies, and make sure everyone is attending and participating.