Halloween is about spirits and ghosts. Also it’s about carving the pumpkins and dressing up, doing the makeup and etc.
So fires were lit to frighten off evil spirits and spooky costumes were worn to escape being recognised by ghosts.
The tradition of carving grinning jack-o’-lanterns might have come from an old Irish folk tale about a farmer called Stingy Jack.
Jack was punished for playing a trick on the devil and was forced to roam the earth with a light in a turnip after his death.
The tradition later crossed over to America where turnip was replaced by the pumpkin.
It also dates back to Samhain, when the Gaels are said to have carve turnips to ward off spirits.
Have a nice and spooky night!