I don’t believe these schools close for Jewish holidays so why a Muslim holiday? I remember my husband’s cousin and wife laughing with us at dinner one night. Seems they went to a school in a predominantly Jewish neighborhood (one in which I used to live, in fact). They each assumed the other was Jewish like most kids... so one day along comes one of the Jewish holidays and the school is OPEN but nobody is in there class except maybe six kids. They looked at each other and realized, “Hey, he/she is not Jewish.” It was love! They were both Catholic. ha ha. I love the story.
In the old days, you took the holiday and didn’t need a school to endorse you or your beliefs. Just like if they stopped Christmas, most Christians would just use a vacation day. The real ones anyway.
Their school calendar says otherwise.