It is not easy to specify a particular day to celebrate the public holiday of Matariki. Matariki falls at a time, not on a day. Our advisory group told us that the Matariki public holiday should fall on the Friday closest to Tangaroa in the month of June. Because the Gregorian Calendar and the Māori Lunar Calendar do not exactly coincide, that day will move slightly from year to year, just like Easter. 