I have a calendar listed under my "iCloud" calendars in the native iCal app that I cannot delete (or share with anyone for that matter). I attempted to share it with my husband but when that wasn't an option I decided to make a new one and delete the non-shareable one and now I can't delete it. It is not a subscribed or shared calendar. When I click the "i" next to the calendar name the only options I have are the edit the name of the calendar and the color. There are no other settings I can change and no "delete calendar" option. Any insight?