If nominations are not made within the time and in the manner prescribed in §§ 917.21 through 917.24, the Secretary may, without regard to nominations, select the member and alternate members of commodity committees on the basis of representation provided in § 917.21. In the event nominations are not made for membership on the Control Committee, pursuant to the provisions of §§ 917.17 and 917.18, by May 1 of each year, the Secretary may select such members without waiting for nominees to be designated.