Jubilie Celebration at Bedford Park, London. (1987) Camille Pissarro (1830-1903)

The picture has something of this: people, tree, cavalry, group, landscape, farm, agriculture, mammal, traditional, grass, outdoors, culture, field, house, sky, nature, two, cropland.
Perhaps it’s a painting of a large group of people in a field with tents in the background and a crowd of people on the other side of the field.