Correctly judging the mood of the crowd is more difficult in foreign cultures. There are, however, a few social constants upon which you can rely almost everywhere in the world.
The best resource for learning these constants and social “rules” is the book Left of Bang. The authors of that book successfully taught the material to US soldiers and Marines stationed in hot zones all around the world.
If you don’t want to read the book, I would suggest the summary article linked below.
Applying the Pillars to Your Everyday Life
The article discusses individual behavioral analysis by focusing on “clusters” of characteristics that allow you to determine if a person is comfortable/uncomfortable and dominant/submissive. Those factors will help you evaluate the target’s intention and attitude towards you.
It’s well worth your time to read.