the United States and parts of the United Kingdom in a spirit of light-hearted horror and fear, which is marked by the recounting of ghost stories, bonfires, wearing costumes, carving jack-o'-lanterns, and "trick-or-treating" (going door to door and begging for candy). Brythonic Celtic cultures In Cornwall and Wales, the autumn ancestor festivals occur around November 1. In Cornwall the festival is known as Kalan Gwav, and in Wales as Calan Gaeaf. Modern-day Halloween is derived from these festivals. Gaelic Celtic cultures During Samhain, November 1 in Ireland and Scotland, the dead are thought to return to the world of the living, and offerings of food and light are left for them. On the festival day, ancient people would extinguish the hearth fires in their homes, participate in a community bonfire festival, and then carry a flame home from the communal fire and use it to light their home fires anew. This custom has continued to some extent into modern times, in both the Celtic nations and the diaspora. Lights in the window to guide the dead home are left burning all night. On the Isle of Man the festival is known as "old Sauin" or Hop-tu-Naa. North America In the United States and Canada, flowers, wreaths, grave decorations and sometimes candles, food, small pebbles, or items the dead valued in life are put on graves year-round as a way to honor the dead. These traditions originate in the diverse cultural backgrounds of the current populations of both countries. In the United States, many people honor deceased loved ones who were in the military on Memorial Day. Days with religious and spiritual significance like Easter, Christmas, Candlemas, and All Souls' Day, Day of the Dead, or Samhain are also times when relatives and friends of the deceased may gather at the graves of their loved ones. In the Catholic Church, one's local parish church often offers prayers for the dead on their death anniversary or All Souls' Day. In the United States, Memorial Day is a Federal holiday for remembering the deceased men and women who served in the nation's military, particularly those who died in war or during active service. In the 147 National Cemeteries, like Arlington and Gettysburg, it is common for volunteers to place small American flags at each grave. Memorial Day is traditionally observed on the last Monday in May, allotting for a 3-day weekend in which