I think we could make our agenda. During this month we could make a list of most wanted questions or subjects. This list shouldn't be too generic with subjects like "we want a campaign map editor" or something like that. A long round of polls would be better to choose where to concentrate our attention. We have just one chance. We have to exploit it to obtain as much information as possible. At first we could decide on which games we could concentrate. How many? Just one, two, three or more? Empire, but not Napoleon? Just Shogun II? Avatar, campaign map or unit? We have to limit area of our questions in some way.
By the way. How long will take this summit? It's just an hour meeting with modders or an entire day dedicated to modders?