Karvachauth is being observed on October 17th in India, US East Coast and Midwest, but in California, the date is 16th. The Livermore Temple will be doing the Karva Chauth Puja / Katha on Wednesday, October 16th 2019 from 5:00 PM to 7:15 PM in three sessions. For those wanting to observe the festival per the tradition of following the date in India there will also be a puja session on October 17th from 4:30 to 5:30 PM.
Update 10/17 – Puja moved to Sai Baba Temple
Sri Sai Temple Pleasanton is organizing Karvachauth Puja on Oct 17 at 4:00 PM
9875 Dublin Canyon Road, Pleasanton, CA