Calendar events all disapeared

[AC Question]

Hi.

I have a Moto G with Android 4.4.2, and I use the built in Calendar App. Yesterday when I opened the app, all events (previous and following) had disapeared. I never actually synced with google calendar, so I don't have them anywhere else. When I input new events, they stay there. Any idea what happened and if I can get the events back?

Thank you.

 

[Gekko]

sync with Google Calendar.

 

[Pochinha]

I've already done that, and it'll probably prevent the events I input from now on from disappearing. Yet, I still don't have access to the old ones, since they were never in any place other than my phone. Could there be a way of getting them back?