I think in that situation you should have a waver to be signed to the effect that you are not held responsible for other peoples actions/reactions to your species. That you are not held responsible for any defensive act on your species behalf etc etc
A behavioural opening would be a must as well before showing your creatures and make sure it is in a controlled enviroment.
Just a start. I don't know about the insurance aspect. We have done a few at libraries and schools and have never bothered with insurance.