A 'Holiday schedule' is a list of intervals of one or more day which identify the days the building may be unoccupied. The holiday intervals are listed in order, with holidays most likely to be taken at the top of the list. The Holidays per year Model Data on the Activities tab at building level defines how many holidays are taken and this 'Holiday schedule' defines which days are holidays. Days are selected from the top of the list working downwards. The data is used to specify EnergyPlus 'SpecialDayPeriods'.
There are two tabs on the Holidays dialog:
Holiday data can be accessed: