How about a conference with everyone who was blogging in 2001. Let's talk about how it's going and what we want to accomplish in the next ten years. 
Or a conference with people named "Dave" on the dais. People with other names would be welcome. In the audience. 
An exclusive invite-only conference for people who are friends with Dave. 
A conference where all the sessions are held in the lobby. Two sessions simultaneously. Great wifi and high bandwidth connections. 
A conference where we discuss big ideas while hiking in the woods. 
A conference where we discuss big ideas while sitting in a hot tub and drinking wine. 