Protected Days prevent recurring timed events from playing while allowing timed events specific to that protected day to play according to their schedule. Basically, they are a way to create exceptions to recurring timed events. You may select a holiday to protect or use the tools provided in the "Protected Days" section to create a specific day to protect.
Select the holiday from the "Holidays" list and click the Protect Holiday button. The holiday will display in the "Protected Days" list.
Add any day, not only a holiday, to the "Protected Days" list. Protection could be applied for a specific day, for a specific year, or it could be set to affect all recurrences of a specific day.
Note: You must specify a name for the new protected day before the [Add protected day] button is selectable.