It's a public school. You can't have a day like that since it would be tantamount to the State endorsing a religious faith.
Supposed they could have such a day, it would be chaotic: from the Westboro Baptists to Roman Catholics to Eastern Orthodox to the Watch Tower folks to Mormons and beyond.
That is why I said if the students requested. Meaning that there was no compulsion from the teachers. Remember it is the 9th district that found parent's had no standing in court to sue a school district that foisted Islam on students.
I am not talking about teachings on comparitive religion but actually compelling students to actually role play being Muslim. I think they were also taken to a Mosque. I am sure some other Freeper can give more extensive detail.