|One other day that most Americans observe, even though it is not an official holiday, is February 14, Valentine's Day, named for an early Christian martyr whose feast day was once observed on that day. On this day, Americans give special symbolic gifts to people they love. They also send special greeting cards called Valentines to such people. Most commonly, the gifts are candy or flowers.
Halloween, the last day of October, has a special significance for children, who dress in funny or ghostly costumes and knock at neighborhood doors. After shouting "Trick or Treat!" they are given gifts of candy or money. Originally a religious holiday—the evening before All Saints or All-Hallows Day, Halloween is now celebrated by Americans more according to ancient Celtic pagan traditions. Some children collect money on this day to help children of other nations through the United Nations Children's Fund (UNICEF).