In Australia it's just confusing. Black Friday was named after devastating bush fires in 1938-39 https://en.wikipedia.org/wiki/Black_Friday_bushfires. Any Friday that has bad bushfires on it tends to pick up the name.

Over the last 5 years or so Black Friday sales have become a thing and I always suffer some degree of dissidence at the naming, as for me at least Black Friday has always had a negative connotation.