https://www.meetup.com/Polyrhythm

Polyrhythm is our community centered around support and creating as safe a space as possible for those who are exploring and practicing compassionate communication, polyamory, and ethical non-monogamy in our lives. 

Membership is free, and some events have a $5 requested donation to covers costs for things like name tags and our Meetup account. 
Find out more at: http://www.polyrhythm.org