The calendar feature is available for you to view and schedule appointments and activities. You can also use privacy controls to decide how your scheduled event is shared.
For more details, download this document: 
calendar_feature_help.pdf
As an instructor, you can edit the information your class sees on its homepage. By doing this, you can display any messages, links, or reminders for your students.
For more details, download this document: editing_class_info_and_posting_class_messages.pdf