Sorry, I think it’s a very unwise thing to do. You may be peaceful, tc. yor movement may be peaceful, etc. but you have no control over opposition groups/people who may become violent or even create a riot.
Also, 4 year olds are too young to understand. I think it actuallly constitutes cruelty to have any small child in a situation that is not specifically for children — I am sick of seeing small children being dragged through supermakets, department stores while parents shop for themselves, etc. People treat their children as if they are accessories, not small humans with a still-developing nervous system and a limited capacity to analyze information.
I didn’t treat my kids like hothouse flowers, they went where I went. They were expected to behave, and I didn’t let them run around out of control. How do you think kids learn to behave in public places? But more to the point, my kids learned early that voting was very important, they went with me and got to observe the process. I’m sorry you think kids should be shielded from those things. BTW, it can be dangerous anywhere you go. That’s part of life.