Two too many people at my park!
Back in the day, it was known as "Anniversary Day", and was originally a Protestant holiday celebrated in Brooklyn back in the times of Civil Wars, gas lighting and tin cans, 1829. The day was celebrated on the first Thursday in June, but today is celebrated every 2nd Thursday of June. The day was commemorating the founding of the First Sunday School on long island. A New York State Legislature enacted in 1959 on request of the Queens Federation of Churches to permit schools in both Kings and Queens Counties to be closed on this day. It was signed by Governor Nelson A. Rockefeller.