William Glackens | May Day, Central Park, circa 1905 | Fine Arts Museums of San Francisco | Image and data from the Fine Arts Museums of San Francisco

May 1st, or May Day, celebrates the beginning of summer. The tradition has been manifested throughout different eras and cultures as the Roman festival of Flora, the Germanic Walpurgisnacht festival, and the Gaelic Beltane. It is also International Workers’ Day, in commemoration of the 1886 Haymarket Massacre in Chicago.

This painting of May Day in Central Park by William Glackens comes to the Artstor Digital Library from the Fine Arts Museums of San Francisco Collection.