; (2) any activity to provide voters or prospective voters with transportation to the polls or similar assistance in connection with any such election; or (3) assisting, promoting, or deterring union organization. (b) Registration No funds appropriated under this subchapter may be used to conduct voter registration activities. Nothing in this subchapter prohibits the availability of Head Start facilities during hours of operation for the use of any nonpartisan organization to increase the number of eligible citizens who register to vote in elections for Federal office. 647. Advance funding For the purpose of affording adequate notice of funding available under this subchapter, appropriations for carrying out this subchapter are authorized to be included in an appropriation Act for the fiscal year preceding the fiscal year for which they are available for obligation. 648. General provisions (a) Limitation Nothing in this subchapter shall be construed to authorize or permit the Secretary or any employee or contractor of the Department of Health and Human Services to mandate, direct, or control, the selection of a curriculum, a program of instruction, or instructional materials, for a Head Start program carried out by an eligible entity. (b) Special rule Nothing in this subchapter shall be construed to authorize an eligible entity carrying out a program or activity or a local educational agency to require the other to select or implement a specific curriculum or program of instruction. . 3. Effective date The amendment made by this Act shall apply beginning on October 1 of the first fiscal year following the date of enactment of the Improvement Act of 2017.