日比谷公園
On 12 October 1960, Yamaguchi was in the large crowd of 2,500 spectators at a televised election debate held in Hibiya Public Hall in Hibiya Park in central Tokyo, featuring Suehiro Nishio of the Democratic Socialist Party, Inejirō Asanuma of the Japan Socialist Party, and Hayato Ikeda of the Liberal Democratic Party. Asanuma was the second to speak, and took the stage at 3:00 p.m.