While there were many monumental grand lectures in the public hall, especially during the height of national tension before and during the war, the lectures on current affairs by government leaders and some Japanist thinkers were always packed to overflowing. The lectures by Prime Minister Kiichiro Hiranuma, Foreign Minister Yosuke Matsuoka, Colonel Sugoro Hashimoto, and others were attended by a crowd that could not fit inside the hall, who then surrounded the venue and applauded the lectures given on stage through the speakers.

At the time of the national convention held soon after the formation of the Trilateral Alliance, the overflowing audience filled the 10,000 square-meter plaza in front of the public hall. After his speech, Prime Minister Hiranuma, on a spur of the moment, stepped out onto the second floor veranda and gave a short speech to the thousands of people in the plaza. This was a pioneering moment of the call to the masses from the Public Hall Veranda.