Highsummer was a special day in the Calendar of Harptos, occurring on the night after Midsummer—this was Eleasis 1, the 1st of the month of Highsun, in most years; or Shieldmeet, every four years. The night of Highsummer was traditionally the time for the Feast of the Moon or the "Festival of Lovers" in Turmish and across the Vilhon Reach. Curiously, on the day before Highsummer each year, every tressym in the city of Ankhapur mysteriously disappeared. The winged cats only returned three days later. The ancient Netherese held festivities on Highsummer.