As the default calendar app for a lot of Android phones, Google Calendar is the easiest way to keep track of your schedule. Here's a look at how to get more out of Google Calendar. To add an attachment to a calendar event, first upload that attachment to Google Drive. Take advantage of keyboard shortcutsIf you use Google Calendar on a desktop, you could be saving a lot of time with keyboard shortcuts. But Google Calendar offers an option to send you a daily wrap-up email each morning.