Welcome aboard. Hope you browse & learn.
To address your question, I believe the answer is no.
Here's the OCDO page about CA laws: http://www.opencarry.org/?page_id=205
From the summary at the top of that page:
Toward the bottom of the page there are several links to more information you might find helpful.Open carry is generally prohibited except in unincorporated areas where the county has not made open carry illegal, or, pursuant to a CA open carry permit issued and valid only in a county with a population of less than 200,000 persons.