Other Michigan students in the Young Republicans organization picketed the event, protesting "anti-American policy." The teach-in ended the next morning, concluding with a 600-person rally on the steps of the library. The Michigan teach-in received national press, including an article published in the March 25, 1965 issue of the "New York Times". It went on to inspire 35 more teach-ins on college campuses within the next week. By the end of the year, there had been teach-ins at 120 campuses. Antiwar teach-ins were held until the end of the Vietnam War. These included:  Not all college students at the time were antiwar protesters, however. At many teach-ins, pro-war students showed up to protest or signed letters of support for college administration, including at Kent State University, the University of Wisconsin, and Yale University. The largest Vietnam teach-in was held on May 21–22, 1965 at U.C. Berkeley. The event was organized by the newly formed Vietnam Day Committee (VDC), an organizing group founded by ex-grad student Jerry Rubin, Professor Stephen Smale, and others. The event was held on a playing field where Zellerbach Auditorium is now located. Over the course of 36 hours, an estimated 30,000 people attended the event. The State Department was invited by the VDC to send a representative, but declined. UC Berkeley professors Eugene Burdick and Robert A. Scalapino, who had agreed to speak in defense of President Johnson's handling of the war, withdrew at the last minute. An empty chair was set aside on the stage with a sign reading "Reserved for the State Department" taped to the back. Participants in the event included Dr. Benjamin Spock; veteran socialist leader Norman Thomas; novelist Norman Mailer; independent journalist I. F. Stone and historian Isaac Deutscher. Other speakers included: California Assemblymen Willie Brown, William Stanton and John Burton; Dave Dellinger (political activist); James Aronson (National Guardian magazine); philosopher Alan Watts; comedian Dick Gregory; Paul Krassner (editor, The Realist); M.S. Arnoni (philosopher, writer, political activist); Edward Keating (publisher, Ramparts Magazine); Felix Greene (author and film producer); Isadore Zifferstein (psychologist); Stanley Scheinbaum (Center for the Study of Democratic Institutions); Paul Jacobs (journalist and anti-nuclear activist); Hal Draper (Marxist writer and a socialist activist); Levi Laud (Progressive Labor Movement); Si Casady (California Democratic Council); George Clark (British Committee of 100/Campaign for Nuclear Disarmament); Robert Pickus (Turn Toward Peace); Bob Parris and Bob Moses (Student Nonviolent Coordinating Committee); Jack Barnes (National Chair of the Young Socialist Alliance); Mario Savio (Free Speech Movement); Paul Potter (Students for a Democratic Society); and Mike Meyerson (national head of the Du Bois Clubs of America).