After installing Mountain Lion on my iMac, calendar items disappeared.

My iPhone, iPad and MBP still have the calendar contents. The one item that still appears on the calendar is a holiday schedule I downloaded from another site a few years ago. I checked the preferences on the iMac and "Calendar" is checked for iCloud. Thanks for any help/suggestions!

Strange as it seems and without having resolved my problem, I decided to enter an appointment fo tomorrow. When I double-clicked tomorrow's date on the calendar to enter the information, like magic, the other appointments appeared.
Therefore, double-clicking a date on the calendar was the answer or it was a magnificent coincidence of timing!

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