I like the idea of a Valve get together, but I honestly wouldn't know the first thing about running a photoshoot. I've only been attending AN for my third year now, so I wouldn't want to step up to the plate.
As AJ pointed out, the random video games photoshoots are occurring on Friday, Saturday, and Sunday; and all have chosen large locations that can accommodate plenty of people. Valve cosplayers too.
So unless someone with a little more experience can run this photoshoot, that's plan B. And it's a solid plan B.
Anime North 2014:
- Thresh - League of Legends
- Phoenix Wright - Ace Attorney Series