The Avatar exhibition started a couple of hours ago and our friends in Seattle already gathered a lot of photos and put them online  (thanks for the link, Ghaziya). I started a page where I collected everything that might be worth adding to the wiki. I also included a couple of candidates for new articles.
Here is the link: User:Faern./Information_collection_from_the_Avatar_expo
Feel free to add anything that you find to that page, or use the information gathered to edit articles.
I also had another idea while creating that collection page: What about creating some articles about real world effects of Avatar? I am talking about things like influences on various projects like the Belo Monte Dam or the oil spill, the development of various big Avatar communities, how Avatar cosplay evolved, demographics, etc.