Apparently I posted this in the wrong place. Apologies to all concerned.
Here's the problem:
Had to change the email for my Apple ID. All went well until the calendar froze with the message "Moving calendars to server account". It's been that way for over 24 hours, although I've forced quit twice, and restarted the computer. I'm running the latest Mountain Lion on iMac. iPhone and iPad calendars are fine. Any help would be greatly appreciated.