You can enjoy Mr. Franklin Weng's awesome keynote "LibreOffice/ODF Migration in Taiwan."
Any other videos in the Kaigi have been published at "LibreOffice Kaigi 2016.12" playlist at YouTube. This list is provided by LibreOffice Japanese Team (LibreOffice Japanese NLP) official channel. The channel also provides videos at another event "LibreOffice mini Conference 2016 Osaka/Japan."
Every talks except the keynote has been in Japanese (because Kaigi is a "Japanese-local" event), but I hope you all enjoy the videos.