My own collection. Halloween is a holiday that falls on October 31. Traditionally, Halloween is mainly celebrated in Ireland, the United Kingdom, the United States and Canada. On October 31, children dress up and when it gets dark they ring or knock on nearby houses that are decorated with pumpkins and lights. When the door is opened, they call out trick or treat!, which means that the choice is given between becoming a victim of a tease (trick) or giving a treat (usually candy). The residents then give the children sweets.