“The festival plaza” with its big roof, designed by Kenzo Tange, was the facility of the Japan World Exposition 1970. The purpose of this study is, first, to examine how the big roof was removed at the seemingly halfway point of 1978, and second, to examine the case of conversion during its temporary existence. Through the analysis, it became clear that it was temporarily preserved as a symbol of “memories” of the Expo in the site utilization plan by Eika Takayama, and that a temporary exhibition hall with a tent structure was constructed for the China Exhibition held in 1974.
