We did the same thing over the summer with our Giants and Mini Rex. It makes the kids so happy to see the bunnies. I brought baby wipes (pop out dispenser) and hand sanitizer. Also brought Cheerio's that the kids could "feed" the bunnies... no carrots, etc.
I rotated the bunnies every 20-30 minutes or so, so no one got over-stimulated or stressed. (Kept some in seperate carriers in the back where it was quieter, and switched them off so they could rest.)
Mine handled it very well, and it was a great opportunity to talk to people about rabbits and their care.
Forgot to mention, I also brought a spray bottle of Vanodine and misted the bunnies from time to time (to kill any germs the kids brought over from the ducks and chickens at the Fair!) LOL! OK, I'm OCD....