# Evolution and global observance of Halloween and related RIT > Live situation record from CLSTR: https://clstr.news/situations/origins-and-evolution-of-halloween > Updated: 2026-10-25T11:40:42.000Z. Sources: 15. Developments: 5. The origins of Halloween are traditionally traced back to the ancient Celtic festival of Samhain, or ‘Samaín’, which marked the transition from the light half of the year to the dark half. Celebrated over 2,000 years ago in regions such as Ireland, Scotland, and the Isle of Man, Samhain was believed to be a time when the boundary between the living and the dead blurred. While often conflated with the Norse festival of Alfablot, Samhain is a distinct Gaelic tradition. Over time, these customs merged with Christian observances, such as All Hallows’ Eve, preceding All Saints' Day. Global variations continue to reflect diverse ways of honoring the deceased. In Mexico, the Day of the Dead involves elaborate altars with cempasúchil flowers and ‘pan de muerto’. In the Huasteca region, the ancestral Xantolo festival integrates music, dance, and community rituals, while in Mérida, markets prepare seasonal offerings like ‘pib’. Recent trends show a growing emphasis on dedicated ceremonies for deceased pets, often observed on October 27. In Spain, local governments in Estepona, Murcia, and Manilva are activating special plans featuring improved cemetery access, free shuttle services, and increased security. In Murcia, measures include reinforced cleaning and medical assistance, while Torrelavega organizes musical performances in cemeteries. Due to the holiday falling on a Sunday in 2026, nine Spanish autonomous communities will experience a three-day weekend. Other regional customs persist, such as Ecuador’s ‘colada morada’, Poland’s ‘znicze’, and the Philippines’ ‘Undas’. ## Timeline ### 2026-10-25: Samaín and Halloween traditions in Galicia and Wiesbaden The Celtic roots of Samaín are explored alongside modern Halloween celebrations and community events in Wiesbaden, Germany. 2 sources. https://clstr.news/cluster/saman-and-halloween-traditions-in-galicia-and-wiesbaden ### 2026-10-24: Origins and evolution of Halloween traditions Halloween's roots lie in the ancient Celtic festival of Samhain, though modern celebrations are shaped by English traditions and American consumerism. 4 sources. https://clstr.news/cluster/historical-origins-of-halloween-differ-from-irish-samhain ### 2026-10-19: Ireland celebrates Halloween traditions and folklore Ireland honors its Halloween roots, the ancient festival of Samhain, through local haunted legends and traditional Irish language terms. 2 sources. https://clstr.news/cluster/ireland-celebrates-halloween-traditions-and-folklore ### 2026-10-19: Origins of Halloween and the history of Samhain Halloween traces its roots to the ancient Celtic festival of Samhain, a harvest celebration distinct from the Norse Alfablot, which later merged with Christian traditions to form modern customs. 2 sources. https://clstr.news/cluster/origins-of-halloween-and-the-history-of-samhain ### 2026-10-14: Halloween traditions and the ancient origins of Samhain Halloween traces its origins to the ancient Celtic festival of Samhain, marking the transition to winter, and has evolved into modern traditions like trick-or-treating and costume celebrations. 5 sources. https://clstr.news/cluster/halloween-traditions-and-the-ancient-origins-of-samhain --- Cite as: Evolution and global observance of Halloween and related RIT. CLSTR, https://clstr.news/situations/origins-and-evolution-of-halloween