They believed that Shamhain called together wicked spirits, fairies, witches and elves to harm people. To exorcise yourself of these ghosts, you set out a food treat. If you didn't, they would trick you. Druids might even ask for your child to sacrifice. This is the time to proclaim powers for control and leadership of the satanic realm of world systems.
Haunted houses are good places to get demons of fear, rebellion and unclean spirits.
Orange, black and red are considered to be the Devil's colors. If we pray to dead saints we are into necromancy which God forbids us to do. This is the custom of lighting fires at night. Very evil activities go on at this time. Fragments from the fires were used for casting spells.