People in China are neither wholly responsible for the actions of their state nor are they wholly separate and apart from it. The state and its people in any society that isn't tearing itself apart reflect one another and share many values. If you don't want your association to be infected by the spirit of self censorship and propriety shared by a 1.4 billion people you can't simultaneously allow them to vote on where to hold the conference or how. You need to settle on a set of rules that isn't up for vote like not holding it in dictatorships or countries without meaningful freedom of speech and press.