Except as may be otherwise provided by law, responsibility for the preparation and presentation of proposed proclamations calling for the observance of special days, or other periods of time, or events, shall be assigned by the Director of the Office of Management and Budget to such agencies as he may consider appropriate. Such proposed proclamations shall be submitted to the Director at least 60 days before the date of the specified observance. Notwithstanding the provisions of § 19.2, the Director shall transmit any approved commemorative proclamations to the President.