For those enrolled in April, 2020 

AY 2020 Matriculation Ceremony for graduate students were scheduled to be held at the Ryogoku-Kokugikan (National Sumo Stadium). However, due to the spread of the novel coronavirus infection, we decided not to use the Ryogoku-Kokugikan as the venue of the ceremonies. Currently, we are considering a number of options for the ceremonies, including cancellation. We will let you know on this page as soon as it is decided.
https://www.u-tokyo.ac.jp/focus/en/articles/z1301_00002.html