The exact dates on which referenda must be held and the hours, voting places, and regulations under which the referenda must be conducted must be established and determined by the board of directors of the North Carolina corporation known and designated as Tobacco Associates, Incorporated, established under the leadership of farm organizations in the state of North Carolina for the purpose of promotion of flue-cured tobacco. Referenda dates, hours, and voting places, and regulations with respect to the holding of the referenda must be published through the medium of the public press in this State by the board of directors at least fifteen days before the holding of the referendum and direct written notice must be given to all farm organizations within this State and to each county agent in any county in which flue-cured tobacco is grown.