I'm really annoyed with Google Calendar. I have certain trouble shooting problems with Google calendar, events that were changed or added on a computer/mobile apps are not showing/updating in computer/mobile applications and I do not get notification for events. So what should I do to fix this problem? Can anybody help me?Â
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Solution 1:Â Turn on and off your sync for 2-3 times.
1.  Open the Settings app on your device.
2.  Find the Data usage section.
3.  Touch menu. It could be an icon in the top right  or a button below the screen.
4.  Make sure Auto-sync data is checked.
Solution 2: Check Calendar sync is on
The general idea:
1.  Open the Settings app on your phone or tablet.
2.  Find the Accounts section.
3.  Choose Google.
4.  Choose your account.
5.  Make sure Calendar is checked.
Solution 3: Calendar is visible and synced
1.  Open the Google Calendar app.
2.  Go to the main menu in the top left.
3.  See if any of your calendars are hidden. You can tell if a calendar is hidden if the color next to it is an outline.
4.  If a calendar is hidden, touch its name so its events show up.
5.  Then, make sure your calendar is synced
Solution 4:
1.  Open the Google Calendar app.
2.  Go to the main menu in the top left.
3.  Choose Settings at the bottom.
4.  Select one of your calendars.
Make sure Sync is on.
