Calendar Event Notifications
To receive email notifications of calendar invitations:
Open your calendar
Click the
in the top right and click 'Settings'
Click Notification settings under General
select the drop down and select Alerts
Select The calendar you want notifications from the left column
Scroll down to 'Event notifications' and select notifications or email if you want to get emails about events. and how long before the events you want to receive the notification.
be sure to check Other notifications right below event locations to stay truly informed