I get the following message when I attempt to create an event in iCal:

The request for account “iCloud” failed.
The server responded with
“507”
to operation CalDAVAddCalendarQueueableOperation.
Also, nothing that I enter into my iPad's calendar get entered into the calendars of my iPhone or Mac.

Was able to fix it after some great help from Apple support.  Turns out I had WAY too many events in my calendar file, over 22,000 going back years and years. Once I archived a bunch, things started working again just fine.  Let me know if this helps.
Chris Altwegg

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