2006 New York Code - Anniversary Day As A Holiday In The Public Schools Of The Borough Of Brooklyn And In The Borough Of Queens, City Of New York.

 
    § 2586. Anniversary  day  as  a  holiday  in the public schools of the
  borough of Brooklyn and in the borough of Queens, city of New York.  The
  first  Thursday  in  June  in  each year, except in those years when the
  first Thursday in June occurs in the same week with Memorial day, and in
  such years the second Thursday in June, known as  anniversary  day,  and
  celebrated  in  commemoration  of the organization of Sunday schools, is
  hereby made and declared to be a holiday in all the  public  schools  in
  the  borough of Brooklyn and in the borough of Queens, city of New York,
  and the board of  education  of  such  city  is  hereby  authorized  and
  directed  to  cause all the public schools in such boroughs to be closed
  on such day.