The Bradley Martin Ball is sometimes referred to as the last big moment of the Gilded Age. It was a very ostentatious event that sparked a lot of debate, and in some ways helped usher in the crumbling of New York’s Victorian-era society culture.
Research:

“Bradley Martin Ball.” New York Times. Feb. 7, 1897. https://timesmachine.nytimes.com/timesmachine/1897/02/07/117897311.pdf?pdf_redirect=true&ip=0
“Bradley Martin Ball.” New York Times. Feb. 9, 1897. https://timesmachine.nytimes.com/timesmachine/1897/02/09/102399244.pdf?pdf_redirect=true&ip=0
“Bradley Martin Ball.” New York Times. Feb. 11, 1897. https://timesmachine.nytimes.com/timesmachine/1897/02/11/100419295.pdf?pdf_redirect=true&ip=0
“Bradley Martin Ball Burlesqued.” St. Francisville Democrat. March 27, 1897. https://www.newspapers.com/image/221401970/?terms=%22Mrs.%20Radley%20Barton%27s%20Ball%22&match=1
“Bradley Martin Dies in London.” New York Times. Feb. 6, 1913. https://timesmachine.nytimes.com/timesmachine/1913/02/06/100387781.pdf?pdf_redirect=true&ip=0
Close, John Weir. “A Giant Cow-tipping by Savages: The Boom, Bust, and Boom Culture of M&A.” St. Martin’s Press. 2013.
“Cost of the Big Ball.” Chicago Tribune. Feb. 10, 1897. https://www.newspapers.com/image/349871575/?terms=Bradley-Martin%20Ball%22&match=1
“Dr. Rainsford’s Advice.” New York Times. Jan. 23, 1897. https://timesmachine.nytimes.com/timesmachine/1897/01/23/117896394.pdf?pdf_redirect=true&ip=0
“Dr. Samuel Johnson on the Bradley Martin Ball.” New York Times. March 5, 1897. https://timesmachine.nytimes.com/timesmachine/1897/03/05/102084126.pdf?pdf_redirect=true&ip=0
Hutto, Richard Jay. “The Party of the Century.” Quest. February 1997. https://www.rickhutto.com/articles/BMBall.pdf
Martin, Frederick Townsend. “Things I Remember.” New York. John Lane Company. 1913. Accessed online: https://archive.org/details/thingsiremember01mart/page/n7/mode/2up
“Martin’s New York Estate $1,277,341.” New York Times. May 9, 1913. https://timesmachine.nytimes.com/timesmachine/1913/05/09/100618128.pdf?pdf_redirect=true&ip=0
MUCCIGROSSO, ROBERT. “New York Has A Ball: The Bradley Martin Extravaganza.” New York History, vol. 75, no. 3, 1994, pp. 297–320. JSTOR, http://www.jstor.org/stable/23182043
Musicians Are Indignant.” New York Times. January 30, 1897. https://timesmachine.nytimes.com/timesmachine/1897/01/30/102398699.pdf?pdf_redirect=true&ip=0
“Newspaper Criticism.” The Kingston Whig-Standard.” March 29, 1897. https://www.newspapers.com/image/783525093/?terms=%22Mrs.%20Radley%20Barton%27s%20Ball%22&match=1
“On Volcano’s Edge.” The Boston Daily Globe. Jan. 27, 1897. https://www.newspapers.com/image/430760530/
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