I've done this before, as long as you put things in ways they can understand they are usually really good. I'd talk to them about what you'd like them to do before showing them the bunny as you'll get their attention better.
We got them to sit in a circle and explainned they had to be really quiet as the bun didn't like loud noises and they had to sit still so they didn't scare him.
Then let the bun out in the middle and he just hopped around to investigate them all.
If Fudge isn't as brave or they're not as well behaved you could have her on your lap and make them que for a stroke.
They like visual aids so I'd take her food bowl and show them what she eats, and some hay that they can handle/smell.
Take some toys to, kids can relate to those and will like the idea she likes to play to.
They might like to see pictures of where she lives if you have some.
Ask them what vegetables they eat and tell them which of those she likes. Then ask them about their other favourites foods and explain that rabbits can't eat pizza or macdonalds, because they don't eat meat.
Compare the doctors to the vets and see if any have had vaccinations and explain she has to have them too.
As long as you put things into context they understand they'll pick up lots. Bet you get some fun questions too