In Germany some people might ask "Hey, let's meet up on calendar week 42", but I then always have to quickly google "when is week 42". I think people who are in the office a lot and have management meetings will know these weeks better.

But only very recently a couple of friends of mine mis-communicated because they had a different week in mind ("so how about we meet this Wednesday?" - "I thought you wrote calendar week 33, not 32, I'm away on seminar all week.")

I much prefer "Hey, let's meet up on the week of November 6th" (the date being the Monday of the week).