1- From calendar page on Google or direct from this LINK

    Click on the plus icon on the left navigation panel and from the popup window chose "Subscribe to calendar .

2- Please copy and paste the calendar ID below

 c_0cf0f1bd232237a598e0f7df53375a8f7cf6b3fa8c817dd092c366f6a6f4993d@group.calendar.google.com

  Click on the poppied calendar, Once you clicked it will be added automatically to your calendars