It is simply not worth it.
This year, I am looking to see if a very specific configuration of laptop goes on sale on a local refurb dealer, and if it's not exactly what I want at a good (ie. heavily reduced) price, it's #buynothingday for me again this year.
Companies have all the interest in having such events adopted locally, since it translates in more sales for them.
But yes, Halloween and Black Friday rank among the more recent and successful American imports in EU, just a few years ago they were virtually unknown.
I'm not sure how it is in the US but at least in Germany the offers and deals are pretty bad and/or not interesting - especially on amazon.
edit: at least retailers are pushing it heavily. I don't know if the general population is really into it.