By default, notifications are turned off. But you can turn reminders on, and choose whether to receive a pop-up notification or an email notification:

  1. Access Google Calendar.
  2. In the upper-right corner of the page, click Settings.
  3. Click the Calendars tab.
  4. Under My Calendars, click the Notifications link for your calendar.
  5. Choose the settings you want.
  6. Click Save.