It's actually the breastcancer.org that sponsors it through a website called meetup.com.
Here's the Philadelphia addy......
http://bcs.meetup.com/cities/us/pa/philadelphia/
I had attempted to start one here but there was not enough. Going back in today to check on this for you, I see there a lot more people listed so perhaps I will try again.
Thanks for ringing that bell for me!
Ginagce