The year is 1924 and the city is Washington, D.C. What's going on here? Your guesses, educated and otherwise, welcome in the Comments box.
As correctly surmised in the very first comments, these are baseball fans. The original caption: "October 3, 1924. Washington, D.C. Waiting in line for tickets for the opening game of the World Series. Picture snapped at 10 p.m. October 3rd, twenty-four hours before the tickets will be placed on sale." | Click image for Comments.