People having fun at the theatre, on and off stage. American. Ashcan School. Everett Shinn, artist (1876-1953).

"The White Ballet." 1904.
“The White Ballet.” 1904. Oil on canvas. Collection of the Smithsonian American Art Museum, Washington DC. In the public domain in the United States because it was published or registered before January 1, 1924. via https://commons.wikimedia.org/wiki/File:Everett_Shinn_-_The_White_Ballet_-_Google_Art_Project.jpg
"Outdoor Stage, France." 1905.
“Outdoor Stage, France.” 1905. Photographed at the de Young Fine Arts Museum, San Francisco. In the public domain due to age. via https://www.flickr.com/photos/greatestpaka/35723798800
"The Hippodrome." 1902.
“The Hippodrome.” 1902. Oil on canvas. Signed on left margin. Image © Art Institute of Chicago. Fair use license. via https://www.artic.edu/artworks/111326/the-hippodrome-london