In each year the first day of January (known as New Year’s Day), the fifteenth day of January of each year prior to 1986, and commencing on the twentieth day of January in 1986, the first Monday occurring on or after January fifteenth (known as Martin Luther King, Jr. Day), the twelfth day of February (known as Lincoln Day), the third Monday in February (known as Washington’s Birthday), the last Monday in May (known as Memorial Day or Decoration Day), the nineteenth day of June (known as Juneteenth Independence Day), the fourth day of July (known as Independence Day), the first Monday in September (known as Labor Day), the second Monday in October (known as Columbus Day), the eleventh day of November (known as Veterans’ Day) and the twenty-fifth day of December (known as Christmas) and any day appointed or recommended by the Governor of this state or the President of the United States as a day of thanksgiving, fasting or religious observance, shall each be a legal holiday, except that whenever any of such days which are not designated to occur on Monday, occurs upon a Sunday, the Monday next following such day shall be a legal holiday and whenever any of such days occurs upon a Saturday, the Friday immediately preceding such day shall be a legal holiday. When any such holiday, except holidays in January and December, occurs on a school day, each local and regional board of education may close the public schools under its jurisdiction for such day or hold a session of the public schools on such day, provided, if a session is held, the board shall require each school to hold a suitable nonsectarian educational program in observance of such holiday. If a holiday in January or December occurs on a school day, there shall be no session of the public schools on such day.