ICal changed itself to Read-Only

This has happened several times now. My iCal calendar that I work in every day to plan my appointmants, to do list, etc. suddenly in the middle of adding an appointment tells me that I cannot add anything because it is a Read-Only calendar. It will no longer allow me to add apoointments, events, to do items, or anything else.
I checked my prefernces and found nothing changed. I restarted and shut down and restarted.
The last time I got an update, the problem disappeared until today.
Anyone have an idea what is going on?

You have one or more read-only calendars in the left sidebar—generally, these are subscribed calendars—and one or more of them is selected. More than one of your calendars in this list is enabled, and you're seeing many events from separate calendars in a single view.
Remember that visually, all of these calendar views are layered. The one selected in the sidebar should be the one you want to enter data into. If a read-only is selected, the disallow message will appear.

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