Is merely buying an unusual costume for a child—such as an Aladdin costume, not a witch costume—to wear to school on its Halloween celebration day impermissible, especially if the school celebrates it merely by children coming in different costumes and the celebrations carry no doctrinal dimension, and they are not held on the 31st but on another day? And has any contemporary [scholar] analyzed it like birthday celebrations?

The so-called Halloween is among the festivals of the polytheists, in which it is not permissible for a Muslim to participate under any circumstances. Purchasing an unusual costume for a child and having them wear it for this holiday indicates participation. Whoever buys something on this day that they would not buy otherwise, or gives a gift, intending to glorify the day like the disbelievers, has committed an act of disbelief. If their intention is merely to enjoy themselves or express affection, they have not committed disbelief, but it is disliked due to resembling thebelievers. It is not permissible to participate in these polytheistic festivals.