WHAT ARE THESE PEOPLE DOING?

I've chosen some famous paintings for you to admire and describe.  There's plenty you can say about these paintings. Think about the weather, the place, what people are wearing and doing, where they are located  ...
My first choice is named "The  peasant dance", and it was painted in 1568 by Pieter Brueghel.
The second one belongs to Henri  Matisse, who painted it in 1917. Its title is "La leçon de musique".  
And third and last Seurat's  "Sunday afternoon on the island of La Grande Jatte" (1886)
Could you match them?