Welcome to Mothering!
I'm going to suggest you look in two places: First, we have forums for different areas in Finding your Tribe. You could try there for something specific. http://www.mothering.com/community/f/83/connecticut-massachusetts-rhode-island
Then, if you don't hear about anything specific there, we have a number of forums about vaccination where you could get some general advice about how to find someone, or talk about vaccination/non vax choices in general. http://www.mothering.com/community/f/47/vaccinations
I hope that helps! :)