[blparent] Watching your child in a large crowd?

[Pipi]

Hey y'all,
I'll start by apologizing for my normal ramblings of length.
Tonight is the school's annual carnival. Savannah is almost 3 and a half now.
At the carnival there is an entire gymnasium full of bouncey castles, inflatable  toys, moon walks, whatever you refer to them as.
This frightens me and I'm really not sure what to do. 
Last year Savannah was afraid of these toys, so it wasn't a problem at all. This yea she loves them. 
I'm not really sure what to do. I want her to have her freedom to go play in the toys because it wouldn't be fair of me not to allow her to do so. 
I also want her to be safe.
Since it will be in a gym, the echo is going to be horrible. There will be lots of screaming loud children. And loads of strangers as well.
I can't get in the toys with savannah and expect her to hold my hand the whole time. That isn't fair to her. How do I effectively keep her safe and allow her the freedom to go be a kid at the same time?
I mentioned the noise because my normal listening at a park and using the call back and forth methods that I usually use aren't going to work in this situation.
Again, the carnival is tonight. Does anyone have any advice?
Thanks so much,
Pipi