Also:  The “big names” in the community, the more famous people, <i>do not have this problem</i>.  For them, the “unplanned social chaos” model of conference organization works <i>perfectly</i> – lots of people are constantly coming <i>to them</i> to talk about the topics that they are interested in – they don’t see the problem, they live in a kind of bubble.  But in reality, this is a <i>symptom</i> of the problem – people seek out the big names because they are the only persons <i>that people know of</i> who are intestested in the topic.  There is no mechanism to make people aware of each other’s interest.