One of OS X Mavericks' coolest features is the addition of a travel time calculator in Calendar. You may not know exactly how make it work, or even know it exists, but rest assured it's there waiting for you.
Simply open the calendar application and open an event. Regardless of if it's a preexisting event or not simply look for the "Add Location" info box below the event title. When you click this box your Mac will tell you the computer would like to access your current location. This allows the travel time calculator to know how far you are from your location. You'll have to weigh any privacy concerns you might have against your desire to use this feature.
Once you've allowed your location to be know type in the address of your meeting/concert/BBQ.You'll see Ca
