It was a two day conference organised by EDiversity 教育大同 which is a parent-initiated group promoting choice and diversity in education in Hong Kong. You can read more about the conference here.
This was second international education/homeschooling conference that our family took part in. The first one took place two years ago in Berlin, Germany. At both conferences Tim was invited as one of the speakers.
Thank you Cam and Arni for inviting us!