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Use the Holidays calendar on iPhone
In the Calendar app , the Holidays calendar displays holidays based on the region set on your iPhone.
Note: The Holidays calendar is a subscription calendar. You can’t add or delete holidays, because subscription calendars can be modified only by the calendar provider.
Show or hide holidays
Tap Calendars at the bottom of the screen.
Select or deselect US Holidays (or the holiday calendar for your country or region).
View the holidays for a different region
You can change your settings to show holidays for a different country or region.
Go to Settings
> General > Language & Region, then tap Region.
In the Calendar app
on your iPhone, tap Calendars at the bottom of the screen.
Deselect the Holidays calendar, then select it again.