I'll be there; see my post in the Bioshock thread in this section. I'll have lights set up in the little carpeted area underneath the entrance to River Scout and Georgia Explorer.
I have 8:00-9:00 blocked off for the Bioshock group; outside of that, no charge for a quick 5-10 minute session for anyone in costume. I'm hoping to get in and set up right as the event starts... but if you've been to Dragon Con before, you know how plans sometimes go
My planned style for that night is dark and hard and contrasty, but I can do a quick reset of my lights a bit for some nice beauty shots.
You might still want to find someone else for some shots with the exhibits/tanks/etc.