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Google Calendar includes two default reminders for any new event you create. If your organization hasn't modified the default values, there should be 10 minute email and 10 minute pop-up reminders. You can see the reminders in the Reminders section when viewing the details of a new calendar event.
Although you can edit the reminders and add additional reminders in this section, the changes you make apply only to that event. Read on to find out how to access and change the default reminders for all events you create.
To edit an existing reminder or create new ones:
Note: If you've set up mobile reminders using the Set up your mobile phone to receive notifications link at the bottom of the Notifications page, you will also see an option for SMS reminders in this menu.
Note: The reminders you set are your personal reminders. Guests will receive reminders for their events based on the personal reminders they set for themselves.
After you've set up your new default reminders, they will display when you create a new event. Note that they do not apply to events previously created.