With anti-war activist Cindy Sheehan as the keynote speaker, events include a display of boots representing the number of lives lost in the Iraq War, the Daily Kent Stater reports.
In addition, the university library opened for public viewing an archival collection of letters and other materials dealing with the events that left four students dead and nine wounded.
Materials range from iconic photographs to the original FBI documents with J. Edgar Hoover's signature.
One letter from a group of French students has the letter "X" in President Richard Nixon's name replaced with a Nazi swastika.
Another written by Jonathan Pannor, 9, suggests the country would be better off without a National Guard.