Okay, one more thing...
No promises here, but I do some video production in the Bay Area and have a green screen set up at my office. I may be able to break this down and get it to Wondercon on Sunday if anyone is interested in being photographed in costume. I will have to try to get some help to get the lights there and need to find a place to do the shots. Wish that Brak's was going to be there to help (I am not the greatest photographer in the world), but he is tied up.
Anyway, if there is some interest I will do what I can to help out and get some shots of folks. Greenscreen is not big enough for a group shot, but I can get two or maybe three in at a time I think. We can drop in some backgrounds afterward for you. I have a friend who won some awards for his pics, so I may be able to get him to help.