My iCal data disappeared! What happened?

All of my calendar data disappeared in my iCal app. What happened? How do I get it back?!!
I changed nothing, upgraded nothing. I just turned the Mac Air on this morning and... nothing. My data seems to still be on my iPhone but I am afraid to sync for fear of losing everything on every device.
Has anyone else had this happen?

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My iCal data disappeared! What happened?

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