The Calendars module is used to manage holidays.
Typically, only a single calendar needs to be defined. However, if a system crosses multiple cultural or geographical boundaries, or consists of multiple sites, then multiple calendars may be needed. Because holidays can vary from year to year, a calendar needs to have each holiday defined for each year. It's best to define all known holidays in advance for the expected lifetime of the system.
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Go to Configuration > Calendar.
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Select Add.
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Enter a name for the calendar.
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Select Holidays as needed.
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Enter the information about the specific holidays that you want the calendar to recognize.
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Press Save and Close.