Each year Zürich is hosting a Street Parade in the middle of the summer. The city turn into a stinky crowded and loud mess. I cannot tell what it is that you can feel more from the distance, … the smell or the noise, but you certainly can see the crowds from very much far away.
If you are interested in the event as such in more details (possibly want to join next year), you might want to check this site.
For me, this was a good opportunity to go out and try to take some few photographs and try out a blurred time-lapse, that I always wanted to do with tons of people.