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       In America, young people can have parties for almost any reason, but birthday parties are probably the most common. Halloween parties are also quite popular.
      There is no fixed rule about how invitations are given for parties. It's possible some invitations will be by word of mouth, but more likely a written (or sometimes email) invitation may be given. If you are given an invitation to a party, it's better to confirm your attendance. In most cases, you would probably write a brief apology if you can't make it, perhaps giving a short explanation of why you can't attend.
     Halloween parties have increasingly replaced trick-or-treat activities, and the guests dress up in costumes and participate in activities appropriate for their age level. Elementary schools may also hold a Halloween festival or parade at which students appear in costume.