DUBLIN–(BUSINESS WIRE)– #Holidays–Rooted in the ancient Celtic festival of Samhain, which marked the end of the harvest season and the beginning of winter more than 2,000 years ago, Halloween can trace its origins to Ireland. This year, the story comes full circle as Derry Halloween, Europe’s oldest and largest Halloween festival, celebrates its 40th anniversary, leading a programme of events across the island that blend history, storytelling, music, food and spectacle. Derry Halloween began organically