How can iCalendar subscription I cancel a subscription on my iMac and iPad?

I have an iMac (2008) running on el Capitan.

In the iCalendar app, it seems to be a subscription to the calendar of Canadian holidays, which I did not need.  I tried to delete these, but get a message on the screen telling me that I can't delete items from a calendar that I subscribe to.      So what I need to know is how to cancel subscription that I wasn't aware of, in the first place?

Any help appreciated.

Try to go to the calendar, click calendars at top left and uncheck the box.

Tags: Mac OS & System Software

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