Early intervention can usually provide you with a list of local playgroups including families with deaf kids, whether they run them or not. Ours pointed us to a school for the deaf that held 3X weekly parent-infant group meetings in ASL with terps, providing us with language development and support in the form of embedded psychologists, other parents of deaf kids, SLPs, and adult Deaf volunteers. We even transferred our early intervention services to the professionals associated with this school.
Depending on your location,
Hands and Voices runs workshops and meetings, sometimes meet ups. And we found a wealth of resources from both our state's Deaf and HH Commission (including a Deaf Mentor) and Children's Hospital Boston's Deaf and HH Program (which also pointed us to a school for the deaf for services and ensured our IFSP was written with a focus on ASL).