Many people who still rely on paper calendars or planners are truly missing out on the dynamic features available in Google Calendar.  If you are a new Google user, or if your an old one that is looking for a few new tricks, check out these features and watch one of the many tutorials available through the playlist below (6 videos). 
Features:

• Share a Calendar
• Create a Secondary Calendar
• Schedule events using Appointment Slots (GAFE Only)
• Attach Documents from Google Drive
• Use Calendar to Communicate Assignments and Due Dates in Google Classroom