Safely remove duplicates calendars?

A multiplicity of calendars was created by an unknown force

resulting in notifications of events cascading along the wall R my

screen. Each calendar seems to have the same info and only one

is enabled in preferences. Delete a (Ctrl-click on it) takes a full

minute - there is not another obvious way to remove. What has the

cause first of their creation? Thank you, Tom

PEAK schedule Prefs

This might help:

Get help with iCloud in dual calendars - Apple Support

Tags: Mac OS & System Software

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