Calendar, previously iCal, has had Time Zone support for a while now. The Mac I’m using that runs OS X Mountain Lion let’s my turn on Time Zone Support in the Advanced tab of the Calendar preferences, so I can be sure to be on time for meetings when I travel away from my current timezone (AKDT).
However, when using Time Zone support in Mountain Lion, calendar events that I scheduled in one time zone wouldn’t ever show me visually that they were. OS X Mavericks takes care of this problem with a small visual cue–now events scheduled in one time zone will show that time zone in their title in Calendar. Here’s how to make that happen.