Avery
We've it in France too,but,generally,there is good promotions on many products during the week before the Black Friday.Then,the next Monday,it is Cyber Monday(similar to the offers on Black Friday,but more focused on high tech stuff),and it often last several days too.
In France,we've the French Days,too,twice a year,similar to Black Friday,and mainly done by websites,like FNAC,Amazon,Cdiscount,etc...even if physical shops can join it too.
Joh
Similar in France.
Avery
For Christmas tree and decorating the house,I don't know for sure,but I think it is mainly done during the first half of December in France.
It's the case in my family,at least.
Avery no one seems to go out around the neighborhood and sing.
Not common in France too...