The UpdateCalibration action is used when the OK button is pressed on the Joystick Calibration menu. The actual calibration is done by the Calibration widget that appears on the Joystick Calibration menu, and has graphs of the joystick axis ranges with blue fill representing the area that has been reached by the moving axes.
The JoystickCalibrate action is just used to change to the Joystick Calibration menu. That's the name of the menu file as well as the name of the menu itself.
Again, all you should have to do is go to the Joystick Calibration menu, wiggle your joystick(s) around until the blue area won't get any bigger, then click OK.
If this is not working for you, are you sure that VDrift is recognizing your joystick device? When you run VDrift from the command line, it reports how many joysticks are connected and usable by the game as it starts up. It will look something like this:
Code:
1 joystick(s) found:
0. Logitech Inc. WingMan RumblePad