Meet Up - Parenting Section
This site has a number of local playgroup listings, one in Carmel Valley even. Note these playgroups for some reason are listed under culture/community as Hip Mama groups not under Parenting.
There are some different categories of playgroups here including playgroups for kids with Autism, working mom groups and single parent groups. I haven’t personally joined any of these groups so can’t speak to the experience. But, if there’s a good match for you it seems worth looking into.

