I also worked in a Museum Blacksmith shop demonstrating. The most common questions were:
"It that a coal fire?", "Why does the iron glow?", "How hot is it?", "How long does it take to make a nail or horseshoe?"
Those kids and adults want to understand what you are doing but it is really out of their realm of experience.
And being in a rural area, I expected farm kids to know what a hoe was used to do. Then the farm kids pointed out their tractor used a 12 bottom plow and cultipacker. No hand tools on a modern farm! But kids with parents that gardened knew how a shovel and hoe were used!
But we also got regular questions like:
"Is that real fire", "Are you a real Blacksmith?"
Questions from the curious but not observant.
And then the disbelievers!
"No kids, the fire isn't real. There is a gas line hidden in the bellows."
That is when I would pull a hot clinker from the fire, drop it in the slack tub, and then hand it to them along with some coal and coke.
Most of the time people want to learn, but don't know what to ask. It can get frustrating answering those questions all day.
I love hearing the questions other people have been asked!