Halloween is a holiday on 31st October (the Christian holiday All Saints' day). In the past, poor people went around asking for food in exchange of a prayer for the dead. Nowadays the tradition was changed. In Ireland and the United States children dress up and go door-to-door collecting candy. This is called trick or treat, meaning that if they don't receive candy they will make a trick or a spell. The carved pumpkin is the symbol of Halloween.