We should definitely go over our subject materials beforehand. I like the idea of an-August time meet-up. I'd like to recommend the 18th, simply because it'll be a few days after my paycheck.
Also, what kind of things were requested for the panel? I'm assuming at least one microphone (though more would be ideal), but if it's possible, perhaps we could also get a projector. This way, one of us could make a slideshow presentation about our subjects.