Google had a weekly meeting where the executives would explain their latest crazy ideas and accomplishments. It's held on Thursday, because Sundar wanted to make people in Japan happier about attending.
Due to timezones? or is there something in Japanese culture that makes friday meetings disliked?
Yes, they wanted to find a time that worked for the major 3 locations- Asia, EU, and US. If they held it on Friday, that was Saturday in Japan.
So it was moved from Friday early evening to Thursday early evening.