Davis Polyamory/Non-Monogamy Community was recently reactivated and hosts happy hour socials. Join the Facebook group to get updates on future events, including poly picnics in the park! 

The Sacramento Polyamory Meetup.com group coordinates monthly gatherings, which alternate between Sacramento and Davis:

The Polyamory/Non-monogamy Group is a currently-inactive therapy group that may become active again.

There is also another Sacramento-based group (other than the Meetup.com group) that has monthly gatherings in Sacramento, and which has some Davis members; join the Sac-Poly yahoo group to find out gathering details.