During this opening party, nobody paid excessive attention to COVID-19 like people normally do in Japan.
There was no requirement to wear a mask!

The people who did not want to get infected wore masks, and those who had received the vaccine and did not feel the need to take any more precautions did not wear masks. 80 percent of the attendees came without a mask.

Switching from wine bottles to small cans of wine proved to be a very popular choice. The only finger food options were individually wrapped Japanese rice crackers and sweets. The “Shiroi Koibito” cookies were especially popular.