I like your dedication! I can do that. The convention schedule is up so let's see what times are best for us. 8:00 PM on Friday looks pretty good. Or if you're planning to get into character, midnight isn't bad either. I have no ideas about Saturday, and considering you have another person with you, I want to leave it to you to recommend a time.
This is my first time at Katsucon so I don't know any good photo areas, but I do think the fountain is overplayed and not appropriate for what we're doing. But with such a nice convention center, I don't think finding a nice spot will be hard. Any ideas?