I definitely hope you can get someone out of costume to help "wrangle" for you and make sure you are safe. Especially if you don't know the location you're going to.
Little things like steps, even a couple at a time, can prove problematic and you will need to negotiate. I have fans in my bucket that can sometimes compromise my hearing as well. I would hate to walk off leaving a kid hanging that wanted to say hi simply because I didn't hear them.
It's great having a friend around for safety and to help with photos.
I hope it's a great time! The first one is hard to forget, so it will be a special day. Have fun!