The director may at the time of mailing to producers a marketing program or amendments to it for written assent, establish a closing date after which assents will not be counted. If he does so, the closing date upon which assents are required to be postmarked in order to be counted shall be shown on the assent form and be announced by a press release for general dissemination which is issued by the director.
Ca. Food and Agric. Code § 59853