In order to permit the observance of authorized ceremonies within the Library of Congress buildings and grounds, the Librarian of Congress may suspend for such occasions so much of the prohibitions contained in sections 167a to 167e of this title as may be necessary for the occasion, but only if responsible officers shall have been appointed, and arrangements determined which are adequate, in the judgment of the Librarian, for the maintenance of suitable order and decorum in the proceedings, and for the protection of the Library buildings and grounds and of persons and property therein.