I hope we can find some way of involving people remotely in the meeting as well - perhaps through a videocam - does anyone know what Wikimania does for this?
If such AV equipment is available at the chosen venue, we could try and live stream video of the meeting (I think that would dependant on the venue being willing to assist us in that). Any kind of 2-way communication would be impractical, though. If people can't attend in person they'll have to chose a proxy, attending remotely is just asking for trouble.