Calender You Cann Edit With Holidays On It. And if you're using multiple calendars, a feature we'll discuss later, you can sometimes create different time zones for each calendar. The calendar will send notifications so you can be confident that nothing is ever forgotten and no appointment is missed.
Even add notes and customize it the way you want.
I appreciate Apple's attempts to be inclusive, but I really don't need to see the holiday for every conceivable world religion and You can not edit the calendar provided, but you can stop using it and use one more suited to your tastes.
These August Calendars are colored and available for free. A good thing about Google calendar is that you can add public holidays of different countries and get notified of an upcoming holiday. Click the More Options button above the calendar and select Advanced customization.