Harry and Everyone who showed up [ooc: Let's say this starts after everyone who's going to arrive has arrived.]
There was a lot of milling around, and the occasional flash of a wand during some impromptu dueling, but for the most part, the group was just not going to run itself. Harry went to the front of the classroom. It wasn't like any of the people there were people he had to be intimidated by. Well, maybe the Aurors. But for the most part, he knew all of them, and they knew him, so he just started talking.
"Can I have everyone's attention?" he said loudly, but not quite shouting. When the general din died down, he continued. "A lot has been going on lately, and we all want to do something to protect ourselves and each other. We've got a disease that no one's worked out a cure for; we've got one Death Eater who has already attacked people in here locked up in the school and being guarded by Aurors; we've got another Death Eater that escaped from Azkaban, broke into the school, and apparently cut some kind of deal to allow him to wander about as he pleases; and finally, we're trapped with all of these things inside a big bubble. If all of that wasn't bad enough, every other day it seems like someone suggests going off into the Forbidden Forest to look for bad guys or clues or something.
"What we all need to focus on first and foremost is sharing information. If you see something suspicious, tell the group. No single person in this room has the answer to what we should do. We each have a part of the answer. We each have a slightly different way of looking at things, and thinking about things, and only by talking to each other and sharing our information and thoughts, and even fears... can we possibly come up with a plan. Anyone here who thinks they know better than the rest of us, or thinks you alone can protect everyone else... well, you're just letting your own issues jeopardise everyone else.
"So, first off, does anyone have any pertinent information they can share? How Neville's doing? Whether or not Bole's said anything useful? Who's working on a cure for the illness? Anything at all?"