OnePlus has revealed that it intends to stretch Black Friday across pretty much the whole of November in 2021. It will hold offer events on various days throughout the month, which may vary from market to market. Nevertheless, the OEM claims that attractive prices for all its phones will debut for the promotion.
https://www.notebookcheck.net/OnePlus-teases-its-Black-Friday-deals-on-devices-such-as-the-9-series-flagships.576136.0.html