Charles Stewart, Sixth Marquess of Londonderry, Carrying the Great Sword of State at the Coronation John Singer Sargent (1856-1925)

The picture has something of this: people, wear, costume, woman, man, music, performance, dress, veil, theatre, opera, theater, castle, royalty, dancer, group.
Perhaps it’s a painting of a man in a white suit and red cape holding a sword and standing next to a little boy in a red and white dress.