I spent 22 years of my life in Hong Kong and was very active in the protests movement.
It’s simply not rationale to try and have a Nostr freedom conference in HK without risking having all your data mined by CCP.
Anyone who tells you differently and says HK is friendly towards tech is being disingenuous, naive or both. HK is a police state in every sense of the word. A Nostr conference in HK would be a honey pot for intel.
Better to go to Japan.