Calendar notifcation not disappearing What is this "1" alerting me to? There does not appear to be anything in any of my Calendars that is requiring my attention. How can I get rid of this?



I'm using a clean installation of Yosemite.
The badge is notifying you of a Calendar notification. There are two cases which causes a badge:


You've been invited to an event.
An event on one of your shared calendars has been modified.


To clear the badge, open Calendar and click Notifications  on the toolbar, then take action on the notification by selecting Accept/Decline/Maybe on an invitation or OK for a change notification.

Also see What&#39;s this button on Calendar.app? regarding the Notifications button on the toolbar.