Calendar appoint missing HELP :(

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1

2018-01-26 14:55

Was busy with editing my appointments in the Calendar, which is my trusted daily task scheduler. After moving an appointment to a different date, I locked the phone and proceed to do some office work. When I unlocked the phone, suddenly the calendar shows only the public holidays, all data which is Important now Gone

I even restarted, Data is missing still
I unSync and reSync, Data is still missing
I uninstall Google Calendar app, and reInstall, Data is still missing

Important Data is now missing, Please, Please Help me