The picture with a bunch of young men on the carriage is specifically French: these are "conscrits", as in. mandatory military conscription, for their three-year military service.
They just finished initial registration, and it was tradition to celebrate, like the guy with the trumpet, probably drink to excess, sing lewd songs, what young men do! It was still practiced when I was a child late 1950s.
Socially, the military conscription has an interesting side benefit: different social classes got to know one another, often developing lifelong unlikely friendships.
It is great to see a record of it. Is the photographer/carpenter in the picture?