The board of school directors or the board of public education of any school district may appoint one or more of its members, its non-member secretary, if any, and its solicitor, if any, as delegates to any State convention or association of school directors, held within the Commonwealth. It shall be the duty of such delegates to attend the meetings of such convention or association, and each delegate so attending shall be reimbursed for travel, travel insurance, lodging, meals, registration fees and other incidental expenses necessarily incurred. Any such board may become a member of the Pennsylvania School Boards Association, Inc., and may pay, out of the school funds of the district, any membership dues which may be assessed by the association at any State convention of school directors to defray the necessary expenses of maintaining the association and of holding the convention. Such expenses shall be paid by the treasurer of the school district, in the usual manner, out of the school funds of the district, upon the presentation of an itemized, verified statement of such expenses.