Roger:
I upgraded to mavericks. and had problems was stuck at "Moving calendars to server account..." . Then I did force quit ical.
I turned off icloud/ical and icloud/reminders per
http://support.apple.com/kb/HT4901
I did not back up data ical data per instruction (should have). Turned back on icloud/ical and most appointments gone! They are gone in iCloud.com as well!
The good news is that : All appointments/calendar events are still on iPhone. Is there a way to get the iPhone view of my Calendar/Events into iCloud and also onto my iMac/ical?
I want icloud and my iMac to have the same calendar events as what is on my iphone. I want all to be syncing.
hopefully you can give me some ideas as it will avoid an appointment with the genius bar at mall of american today :-)