Crowd scenes with everyone decked out in their best clothes by French artist Eugène Louis Lami. Living from 1800 to 1890 he also illustrated books and painted people one at a time but I like these best.

"Opening of the Great Exhibition, 1 May 1851."
“Opening of the Great Exhibition, 1 May 1851.” Watercolor. Commissioned by Queen Victoria. In the Royal Collection. In the public domain in the United States because it was published before January 1, 1924. via https://www.rct.uk/collection/452380/the-opening-of-the-great-exhibition-1851
"L'Entrée de Son Altesse Royale la Duchesse d'Orléans dans le jardin des Tuileries le 4 juin 1837." 1841.
“L’Entrée de Son Altesse Royale la Duchesse d’Orléans dans le jardin des Tuileries le 4 juin 1837.” 1841. Image © Tessier Sarrou and Associates, Paris. Fair use licence. via http://www.tessier-sarrou.com/html/fiche.jsp?id=7681923
"The Grand Staircase at Buckingham Palace, State Ball, 5 July 1848." 1848.
“The Grand Staircase at Buckingham Palace, State Ball, 5 July 1848.” 1848. Watercolor and bodycolor. Commissioned by Queen Victoria for her Souvenir Album. Image © the Royal Collection. Artwork in the public domain in the United States because it was published before January 1, 1924. via https://www.rct.uk/collection/919902/the-grand-staircase-at-buckingham-palace-state-ball-5-july-1848