WHO?-The Celtics started Halloween.
WHAT?- Hallows Eve, known as Halloween in America.
WHEN- October 31 of every year
WHERE- Celebrated everywhere in the world.
WHY- It is celebrated because it is the day before the christian holiday All Saints Day.
HOW-People celebrate halloween by dressing and painting they're faces and making chocolate skulls and decorating them also having community activities like parties and parent trick or treating.