Sandbagger, from a safety standpoint, there is something I want you to consider, which is surely (hopefully) something that they think about at conventions, and that is...
First, you are Iron Man which is awesome enough on its own, but not only that, you are also made of metal which is even more awesome
So, if I'm a kid (or hell, anyone), of course I'm going to want to take a picture with you, which may involve my body coming into contact with you.
That contact is the concern. You don't want to cut anyone, the people running the convention don't want to be liable for you cutting anyone, and heaven forbid a kid accidentally get cut in front of their parents, who don't want their kid to be hurt, accident or not.
So here's what you can do:
Start with a full-point safety inspection. Sand EVERY edge before you even run your hand over every edge to begin with, and then ones that still feel sharp, sand them some more.
If all else fails, you can try to roll the edges, I know that this would affect the look of the suit, so you'll want to avoid it where possible, but it should help with the safety.
For points you cannot avoid, you can always add a rubber cap (or something similar to one).
You might want to put a rubber cover on your knees and elbows even if they don't have any nasty edges, because those are the joints that are most likely to accidentally hit someone.
Your knees... could hit a short kid that runs horizontally in front of you that you might not pick up in your vision while walking.
Your elbows... could hit someone when you turn around or point or when you put your arm around someone for a photo.
I still absolutely love your suit, and I hope you can get into every convention you take it to, but I thought you might enjoy a few thoughts from someone who has worked with a competitive robotics team for 9 years, where safety is a major focus.