The Allegiance of the Silesian Diet before Frederick II in Breslau Adolph von Menzel (1815-1905)

The picture has something of this: people, group, wear, woman, many, outfit, dancing, veil, royalty, man, dress, performance, leader, monarch, ceremony, dancer.
Perhaps it’s a painting of a group of people standing in front of a man in a red suit and a woman in a white dress.