Anne-Louis Girodet de Roucy-Trioson – Napoleon Receiving the Keys of Vienna at Schönbrunn, 13 November 1805 Château de Versailles

The picture has something of this: people, group, many, wear, music, woman, man, dancer, dancing, ceremony, veil, crowd, military, costume, festival, performance, outfit, child.
Perhaps it’s a painting of a group of people standing next to each other in front of a crowd of men and women with a horse in the foreground.