Un/official picture taking area?

I've been to otakon the last 2 years and had decent success in being noticed, i got pictures taken in just about every area of the convention but wanted to know if there is a official or unofficial area where people hang out to get their picture taken. I know you cant carry around a sign asking for your picture taken lol that would be weird anyway. I noticed the area in front of the cafeteria/gaming hall/stairs seems to be a hot spot but is usually crowded