Hop-tu-Naa (/ˌhɒp tuː ˈneɪ/ HOP too NAY;[1] Manx: Oie Houney; Irish: Oíche Shamhna [ˌiːçə ˈhəunˠə]) is a Celtic festival celebrated in the Isle of Man on 31 October. It is the celebration of the traditional Gaelic festival of Samhain, the start of winter. It is thought to be the oldest unbroken tradition in the Isle of Man.[2]