Note that the NAC also seeks to include people with expertise and community connections related to "other" underrepresented or undercounted populations, not only racial and ethnic populations.
Here's some key information from the announcement.
"The Committee aims to have a balanced representation among its members, considering such factors as geography, age, gender, race, ethnicity, technical expertise, community involvement, knowledge of hard to count populations, and familiarity with Census Bureau programs and/or activities. The Committee will include a minimum three members with expertise on or with experience representing each of the following populations: African American; American Indian and Alaska Native; Asian; Hispanic; and Native Hawaiian and Other Pacific Islanders. The Committee aims to include members from diverse backgrounds, including state, local and tribal governments, academia, research, national and community-based organizations, and the private sector."
"Please submit nominations to Jeri Green, Chief, Office of External Engagement, U.S. Census Bureau, Room 8H182, 4600 Silver Hill Road, Washington, DC 20233. Nominations also may be submitted by fax at 301-763-8609, or by email to jeri.green@census.gov and tom.loo@census.gov."
"Individuals, groups, and/or organizations may submit nominations on behalf of candidates. A summary of the candidate's qualifications (resumé or curriculum vitae) must be included along with the nomination letter. Nominees must be able to actively participate in the tasks of the Advisory Committee, including, but not limited to regular meeting attendance, committee meeting discussant responsibilities, review of materials, as well as participation in conference calls, webinars, working groups, and/or special committee activities."
For more information, check out the Federal Register notice: Request for Nominations of Members to Serve on the National Advisory Committee (NAC) on Racial, Ethnic, and Other Populations.