Japanese troops depart for Manchuko and celebration to commemorate dead who fought in Shanghai

The video discusses the historical context of Manchuria as a puppet state, the political gestures of the new cabinet in Japan, and the commemoration of Japanese troops who died in the war against China in Shanghai. It highlights Tokyo's holiday, which serves both as a celebration of the current army and a remembrance of past sacrifices.

What event is being commemorated in the demonstration mentioned in the text?

What does the holiday in Tokyo represent according to the text?