Calendar is automatically creating Location points - Why?

I'm using Calendar version 6.0 running on Mountain Lion 10.8.4 on an iMac. For some reason when I make a diary entry a location point is automatically created.As you can see on the above example Calendar has automatically created "The Day" as the location which is nonsense. I never type anything into this box. I simply leave it as None. Most of the automatically created locations do not make any sense. I'm at a loss as to how to turn this extremely annoying function off.

Your help would be appreciated.

Thanks,

Dave