Whether Christians accept it or not, we Muslims should not accept this holiday. It is meaningless. Wearing costumes, going tricking and treating and decorating houses with witches, spider nets and wasting so much pumpkins, etc., are all repugnant things. It is strange to see reasonable people acting as weirdo and doing foolish things. It is also becoming quite dangerous nowadays.
Some people really act like monsters and witches.
Muslims should not participate in this holiday.