Halloween in Prague
Halloween is a Celtic holiday where the day of October 31 was considered the boundary between the world of the living and the dead. The Celts would build altars with bird feathers or animal skulls to establish a connection with the dead, for whom they would then hold worship ceremonies.
People put on masks and disguises to protect themselves against evil spirits. Fires made of pumpkins were made to light the souls of the dead on their way to the world.
The customs of today's Halloween developed in Ireland, then continued to the USA, and from there other countries adopted it as American culture expanded.