N.C. Gen. Stat. § 120-17

Every person desiring to appear either in person or by attorney to introduce testimony, or to offer argument for or against the passage of an act or resolution, before any committee of either house of the General Assembly, shall first make application to such committee, stating in writing his object, the number and names of his witnesses, and the nature of their testimony. If the committee consider the information likely to be important, or the interest of the applicant to be great, they shall appoint a time and place for hearing the same, with such limitations as may be deemed necessary.