In my opinion....reference s are the last step. When I am sure that they are a good fit for me. And honestly, I have never ever had a parent ask for references; when I eagerly hand them over, none have called. Perhaps for you a general email to those you have asked to be willing to provide references that you are conducting interviews and that they may receive calls (or emails) over the next little while? This way you don't have to let them know with each potential client?