If you use Calendar (née iCal), you can copy all visible events in any view and paste them in text form into any application. For example, if you're in Day view, you can copy all your events and paste them in an e-mail to send to someone, to show them your schedule. Press Command-A to select them all, then Command-C to copy them.
The name of the event will be in bold, and the date will display like this:
scheduled October 5, 2012 from 8:00 AM to 9:00 AM
Calendar will warn you if you are copying repeating events that only the currently visible event will be copied.
Unfortunately, this doesn't work with my calendar application of choice, BusyCal.
H/t ThomasWoodrowWilson on Reddit.
Mac OS X Hints