You can create events for students to sign up with by creating an event, Choose "For All Students" and then choose "Require students to register". The event will be placed on your calendar as an "open" event which students have the option of registering for. If you are setting up the schedule for the year, teachers will create one week of open events in September and ask students to sign up for their slot. Once a slot is filled, the teacher then edits that event and extends it through the school year.