Answer: It appears that the concept of "Black Friday" is purely a business marketing concept and has no pronounced connection with any religion or religious practice. As such, it would be deemed permissible for Muslims to trade in and benefit from such promotions.
Muslims should however bear in mind that making purchases and taking advantage of promotions and sale items should be done according to need and with moderation. One should exercise caution and avoid wasting time in frivolity of the market place and impulsive buying of goods one does not require based on availability and greed.
And Allah Knows Best
Shafique Jakhura (Mufti) MD Mangera (Mufti)