Can I retrieve a lost calendar from a back-up?

Lost Calendar: I have an 8 GB MacBook Pro (13-inch Late 2011) processor 2.8 GHz Intel Core i7, memory 8 GB 1333 MHz DDR3, running OS X Yosemite 10.10.2 and 16 GB iPhone 5s with iOS 8.1.3. I am using Calendar version 8.0. About a week ago my primary calendar which I share with my husband just went missing from computer, my phone and his phone. He noticed it. I was not aware of doing ANYTHING that would have deleted this calendar, nor did I have any warning that I might be deleting it. I attempted to restore from a back-up but do not have the expertise required if it is even possible.

Forgot Your Account Password
For Lion, Mountain Lion, or Mavericks
    Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     When the menubar appears select Terminal from the Utilities menu.
     Enter resetpassword at the prompt and press RETURN. Follow
     instructions in the dialog window that will appear.
     Or see:
       Reset a Mac OS X 10.7 Lion Password
       OS X Mountain Lion- Reset a login password,
       OS X Mavericks- Solve password problems,
       OS X Lion- Apple ID can be used to reset your user account password.
For Snow Leopard and earlier with installer DVD
     Mac OS X 10.6- If you forget your administrator password,
     OS X- Changing or resetting an account password (Snow Leopard and earlier).
For Snow Leopard and earlier without installer DVD
    How to reset your Mac OS X password without an installer disc | MacYourself
    Reset OS X Password Without an OS X CD — Tech News and Analysis
    How To Create A New Administrator Account - Hack Mac

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