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

Getting out and about with American artist William James Glackens (1870-1938). A realist painter, he was one of the founders of the Ashcan School.

"Children Roller Skating." After 1913.
“Children Roller Skating.” After 1913. Oil on canvas. Collection of the Museum of Art Fort Lauderdale. In the public domain in the United States because the artist has been dead over 70 years. via https://commons.wikimedia.org/wiki/File:Children_Roller_Skating_by_William_J._Glackens,_after_1913.jpg
"The Beach, Isle Adam." ca. 1925-26.
“The Beach, Isle Adam.” ca. 1925-26. Oil on canvas. Image © Swann Galleries, New York. Fair use license. via https://catalogue.swanngalleries.com/asp/fullCatalogue.asp?salelot=2452++++++41+&refno=++726569&saletype=
"Bal Martinique." 1928.
“Bal Martinique.” 1928. Oil on canvas. Private Collection. In the public domain in the United States because the artist died over 70 years ago. via https://www.the-athenaeum.org/art/detail.php?ID=50841
"Music Hall Turn." ca. 1918.
“Music Hall Turn.” ca. 1918. Oil on canvas. Collection of the NSU Art Museum, Fort Lauderdale. © Copyright – NSU Art Museum. Fair use license. via https://nsuartmuseum.org/exhibition/glackens/
"Beach Umbrellas at Blue Point." ca 1915.
“Beach Umbrellas at Blue Point.” ca 1915. Oil on canvas. Collection of the Smithsonian American Art Museum, Washington DC. Image © Smithsonian American Art Museum, Washington DC. Fair use license. via https://americanart.si.edu/artwork/beach-umbrellas-blue-point-9131

Heading off to the beach with American artist Maurice Prendergast. Living from 1858 to 1924, he was a member of the Ashcan School. Also did many pictures of Central Park.

"On the Beach Saint Malo." 1907.
“On the Beach Saint Malo.” 1907. Collection of the Addison Gallery of American Art (Phillips Academy), Andover. Fair use license. via https://www.wikiart.org/en/maurice-prendergast/on-the-beach-st-malo
"Revere Beach." ca. 1896. Private collection.
“Revere Beach.” ca. 1896. Private collection. Image © 2014 – 2019 New England Historical Society. Fair use license. via http://www.newenglandhistoricalsociety.com/flashback-photos-maurice-prendergast-paints-new-england-at-play/
"South Boston Pier." ca. 1896.
“South Boston Pier.” ca. 1896. Image 2012-2019 KERRISDALEGALLERY.COM. Fair use license. via http://kerrisdalegallery.com/print/maurice-prendergast-south-boston-pier/

Paintings of the great outdoors by American artist George Benjamin Luks (1867-1933). Ashcan school.

"Holiday on the Hudson." ca. 1912.
“Holiday on the Hudson.” ca. 1912. Oil on canvas. Collection of the Cleveland Museum of Art. via commons.wikimedia.org/wiki/File:%27Holiday_on_the_Hudson%27_by_George_Luks,_c._1912.JPG
"The Swan Boats." ca. 1922.
“The Swan Boats.” ca. 1922. Oil on canvas. Sothebys. via commons.wikimedia.org/wiki/File:The_Swan_Boats_by_George_Luks.jpg.
"Verdun, France." ca. 1915.
“Verdun, France.” ca. 1915. Watercolor on paper. The Phillips Collection. via commons.wikimedia.org/wiki/File:George_Luks_-_Verdun,_France_-_Google_Art_Project.jpg.

These images are all in the public domain, “The Swan Boats” being in the public domain in the United States because its creator died before 1948.