There were conferences in 2005 and 2006 (see threads below)
The biggest problem with the way they were set up is that it required one chapter to be willing to take on all the planning and responsibility to set it up. I think they also wanted it to rotate around to different campuses every year. It was bound to fall through the cracks at some point, and it did.
What would be interesting is if you could recruit girls from chapters around the country and work together as locals to plan an event. As much as having it in only one place hurts because its always going to be a bigger travel for one group than another, it would gice some stability to the event for the first couple years. Not only would it build bonds between locals and increase networking, it would also give you guarenteed attendees from those chapters and a semblance of longevity since it doesn't depend on one chapter getting its act together. Not that there aren't definite fallbacks to this option either, but I think a local conference is such a great opportunity for locals to learn from each other and develop into stronger groups and anything you can do to keep this going would be fantastic.
If you wan't to go this route, you should also strongly consider finding an advisor to a local sorority (who is planning to be around for a while) that would be willing to take on some of the planning and would be able to help plan it each year and make sure it happens. Maybe even an alum from a local who could be very dedicated?
Anyways, those are just a couple of ideas I was thinking about reading your posts. You can probably get some contact for the past events and maybe some information about who they invited/who attended from their threads.
http://www.greekchat.com/gcforums/sh...ad.php?t=72344
http://www.greekchat.com/gcforums/sh...ad.php?t=64145