“Day of the Truce,” Clifford D. Simak, 1963 — The Punks versus the suburbanites in a fortified, futuristic community.
Comments: Theme of generational conflict. Read in Nightmare Age. Wikipedia: “The local ‘Punks’ take advantage of the once-a-year truce to ransack the last fortified house in the suburbs.”
Author: Wikipedia: “Clifford Donald Simak (August 3, 1904 – April 25, 1988) was an American science fiction writer. He was honored by fans with three Hugo awards and by colleagues with one Nebula award and was named the third Grand Master by the Science Fiction and Fantasy Writers of America (SFWA) in 1977.”