Halloween Festival Images for Facebook, WhatsApp: Halloween has derived its customs from the traditional practices of the Celtic people, who lived in what is today known as United Kingdom and parts of Western Europe. They held huge celebrations near the end of the month of October, marking the end of summer season. Gradually, the celebrations spread across other parts of the world. However, different countries of the world celebrate Halloween in their own varied ways. The roots of Halloween customs are deeply entrenched in the traditional practices of the Scottish and Irish people.