Calendar open file while sleep I have a calendar event set to open an application at an early time. However during this time, my Mac is at sleep. Will the calendar wake the Mac to open the application? If not, how can I make it so that it will do that?
OS X's Calendar.app will not wake a sleeping Mac to open your file.

There are three ways to have your Mac wake up at the appropriate time:


You can use OS X's built-in Energy Saver settings to schedule your Mac to wake 
up.

You can use pmset on the command line to schedule more events.
You can use a third party tool like Power Manager to schedule more sophisticated sequences of wake and power-on events.


Disclosure: I am an engineer who works on Power Manager; so feel free to ask technical questions.