N.H. Rev. Stat. Ann. § 295:5

Such corporations may adopt bylaws, not repugnant to the laws of this state, to provide for the election, removal and retiring of members; to fix the times and places of holding meetings and the manner of calling and conducting them; to regulate the number of officers, the manner of choosing them, their tenure of office and their powers and duties; and to promote the objects of the corporation; and they may alter and amend such bylaws.