N.Y. Educ. Law § 2586

§ 2586. Anniversary day as a holiday for pupils in the public schools\nof the borough of Brooklyn and in the borough of Queens, city of New\nYork. The first Thursday in June in each year, except in those years\nwhen the first Thursday in June occurs in the same week with Memorial\nday, and in such years the second Thursday in June, known as anniversary\nday, and celebrated in commemoration of the organization of Sunday\nschools, is hereby made and declared to be a holiday for pupils in all\nthe public schools in the borough of Brooklyn and in the borough of\nQueens, city of New York, and pupils shall not be required to attend the\npublic schools in such boroughs on such day.\n