Cal. Gov. Code § 84103

(a) If there is a change in any of the information contained in a committee registration, the committee shall amend its registration within 10 days to reflect the change. The Secretary of State shall make available to the local filing officer designated by the filer on their registration the information filed pursuant to this subdivision.

(b) (1) In addition to amending a committee registration as required by subdivision (a), a committee as defined in subdivision (a) of Section 82013 shall amend its committee registration within 24 hours if the change requiring the amendment occurs within 16 days before the date of the election in connection with which the committee is required to file a preelection report, and if any of the following information is changed: (A) The name of the committee. (B) The name of the treasurer or other principal officers. (C) The name of any candidate or committee by which the committee is controlled or with which it acts jointly. (2) The amendment shall include the changed information, the date of the change, and the committee’s name and identification number. (3) Within 24 hours, the Secretary of State shall make available to the local filing officer designated by the filer on their registration the information filed pursuant to this subdivision.

(c) (1) If an amendment to a committee registration identifies a new treasurer or assistant treasurer that person shall complete the acknowledgment required by subdivision (d) of Section 84102.

(2) A failure to complete the acknowledgment pursuant to paragraph (1) is not a violation of this title. However, the Secretary of State shall not accept an amendment to a committee registration that identifies a new treasurer or assistant treasurer unless the acknowledgment has been completed.