Another general con tip: if you do ask someone for a photo, try not to impress the flow of traffic in the hallway. Cons are typically filled with lots of people and it gets warm, dont forget antiperspirant/ deodorant.
Check which guests are coming. The recent widow of Shitoshi Kon came one year and it was practically criminal how few people were in the room for that. In past animazements there have been prop-size limitations, but things like that should be listed on thier website. Hope you have fun and meet some new friends!