You beat me to it. Awhile back I looked for a 2024 calendar that didn’t have the Muslim holidays on it. I suppose such calendars exist. But in my brief search I couldn’t find one.
So it’s only a matter of time before the Muslim holidays are added to a school calendar.
I’d guess a day someday will be called Illegal Immigrant Day.
Jewish holidays have been on calendars forever and nobody gets those off.