Eating outside in summer in the 19th century. Various artists from various places. All making you want to pack that picnic hamper now.

"The Tea Party." Undated.
“The Tea Party.” Undated. American. Arthur Watson Sparks, painter (1871- 1919). In the public domain in the United States because the artist has been dead over 70 years. via https://americangallery.wordpress.com/2011/page/12/
"Holyday" (The Picnic). 1876.
“Holyday” (The Picnic). 1876. French. James Tissot, painter (1836-1902). In the public domain because the artist has been dead over 70 years. via https://www.oel-bild.de/en/The-Picnic~8534.htm
"Breakfast Time." 1887.
“Breakfast Time.” 1887. Swedish. Hanna Pauli, painter (1864-1940). © National Museum, Stockholm. Fair use license. via http://collection.nationalmuseum.se/eMP/eMuseumPlus?service=direct/1/ResultDetailView/result.inline.list.t1.collection_list.$TspTitleLink.link&sp=13&sp=Sexhibition&sp=SfilterDefinition&sp=0&sp=3&sp=3
"Luncheon of the Boating Party." 1880-1881.
“Luncheon of the Boating Party.” 1880-1881. French. Pierre-Auguste Renoir, painter (1841-1919). Phillips Collection, Washington, DC. In the public domain in the United States because it was published before January 1, 1924. via https://commons.wikimedia.org/wiki/File:Pierre-Auguste_Renoir_-_Luncheon_of_the_Boating_Party_-_Google_Art_Project.jpg