Cal. Gov. Code § 6705
A special or limited holiday is a holiday applying only to a special class or classes of business, or a special class or classes of persons, and not appointed to be generally observed throughout the State by all classes of business and all classes of persons.
On any special or limited holiday appointed by the President or Governor, all courts and public offices of the State, any political subdivision, or any city, shall be open and function in their normal and usual manner. All other public functions shall be performed as on days which are not holidays, and all contracts shall be performed and business transacted as usual, except only as to or by the particular class of business or persons expressly limited or restricted by the provisions of the proclamation appointing or declaring such special or limited holiday.
Ca. Gov. Code § 6705