Screenshot/Business Insider JapanTen days ago, I traveled to Tokyo to help Business Insider launch its latest international edition in Japan. After many days of hard work and preparation by our Japanese team, Business Insider Japan went live officially on Monday at noon local time. Over the last several years, Business Insider has launched local editions in France, Germany, Italy, Sweden, Poland, the Netherlands, and, of course, the United Kingdom, among others. To celebrate the launch, Mediagene, our Japanese partner company, arranged a packed day of press conferences and parties. Here's what happened.A press conference was scheduled for 1 pm local time at The National Art Center in Roppongi, a posh neighborhood in Tokyo known for its nightclub scene.