First, there is no calendar to let you set the holiday of the year.

The holiday mode is just let you set power on or off the outlet of PDU.  

1. Press "Energy" icon and go to "configuration".

2. At Holiday mode, please choose "power on" or "power off" option.

After setting, press outlet port 8 button for more than 8 seconds to enable to holiday mode.  You will see the HD shown on LCD of PE6208AV.

To disable the holiday mode, just press the outlet 8 button more than 8 seconds.  The outlets status will be back to the status before enable holiday mode.