Cal. Gov. Code § 9515

If on the day the Governor desires to return a bill without his approval and with his objections thereto the house in which it originated has adjourned for the day, he may deliver the bill with his message to the Secretary of the Senate if it originated in the Senate, Chief Clerk of the Assembly if it originated in the Assembly, or any member of the house in which it originated. Such delivery is as effectual as though returned when the house was meeting.