“The first celebration using the term Veterans Day occurred in Birmingham, Alabama, in 1947. Raymond Weeks, a World War II veteran, organized “National Veterans Day,” which included a parade and other festivities, to honor all veterans. The event was held on November 11, then designated Armistice Day.”
(Quoted from “The Origins of Veterans Day” located at https://www.va.gov/opa/publications/celebrate/vetday.pdf – a PDF promulgated by the U.S. Department of Veterans Affairs.)