How to remove Islamic holidays from iPhone& Mac calendar
How to remove Islamic holidays from apple iPhone calendar :
Go to Settings > Accounts & Passwords > Add Account > Other > Add Subscribed Calendar and paste in the link:
webcal://files.apple.com/calendars/US32Holidays.ics
It is given the name “US Holidays” or you renamed what you like.
Then in Calendar activate that calendar named” US Holidays” or what you renamed.
How to remove Islamic holidays from Apple’s MAC calendar
If the Islamic Holidays are showing up go to the menu option and uncheck the box “US Holidays” . It takes it all Islamic and US holidays aways. Then go to menu> file> new Calendar subscription > paste link in address in the box “Calendar URL”:
webcal://files.apple.com/calendars/US32Holidays.ics