1- There is nothing wrong with buying items on Black Friday and taking advantage of the discounts and deals that are offered, even if this is connected to Thanksgiving or follows it, or these discounts are offered for people to buy Christmas gifts, so long as the purchaser buys permissible things and does not buy things for the purpose of celebrating Christmas, such as gifts and other things.
2- Muslim shop owners should not single out Black Friday for reducing prices because it involves imitating and resembling the disbelievers.