.. :: Halloween :: .. a masquerade custom that is celebrated in many countries on the evening of October 31st. References to Halloween are often seen in popular culture, mainly American. Halloween is most vigorously celebrated in the United States, Canada, Ireland, Australia and Great Britain. Although the day is not an official holiday, it enjoys the greatest popularity after Christmas. Halloween in Poland appeared in the 1990s. The main symbol of the holiday is a hollow and highlighted pumpkin with chipped teeth. Other popular themes include ghosts, demons, zombies, vampires, witches, skulls, bats, black cats, cobwebs, etc.