You can set up to 19 holidays.
In the Setup Holidays window, you can specify:
A range of dates that your office is closed
Whether the holiday is recurring
Holidays are displayed in the following windows:
Daily Appointments (Daybook)
By Book (Book At A Glance)
Month At A Glance
History Appointments
A warning is displayed when you attempt to schedule an appointment on a holiday. If color scheduling is enabled, holidays are displayed in the assigned color.