When, in the opinion of the board of school directors or of the board of public education, attendance of one or more of its members and of its non-member secretary, if any, and of its solicitor, if any, at any meeting held within the Commonwealth (other than annual State conventions of school directors) or the attendance of one or more of its members and of its non-member secretary, if any, and of its solicitor, if any, at the annual convention of the National School Boards Association or any other educational convention, will be of educational or financial advantage to the district, it may authorize the attendance of any of such persons at such meeting within the Commonwealth and at the annual convention of the National School Boards Association or any other educational convention, wherever held, not exceeding two meetings in any one school year in addition to annual or special conventions of the intermediate unit. Each person so authorized to attend and attending shall be reimbursed for all expenses actually and necessarily incurred in going to, attending and returning from the place of such meeting, including travel, travel insurance, lodging, meals, registration fees and other incidental expenses necessarily incurred. Actual travel expenses shall be allowed. All such expenses shall be itemized and made public at the next meeting of the board. Such expenses shall be paid by the treasurer of the school district in the usual manner out of the funds of the district, upon presentation of an itemized verified statement of such expenses: Provided, That advanced payments may be made by the proper officers of the district upon presentation of estimated expenses to be incurred, to be followed by a final itemized, verified statement of such expenses actually incurred upon return from such conventions, and a refund be made to the district of such funds remaining or an additional payment be made to meet the verified expenses actually incurred.

Each member of an intermediate unit board of directors shall be reimbursed by the intermediate unit and each member of a school district board of directors shall be reimbursed by the school district for mileage and for all expenses actually and necessarily incurred in attending meetings, conventions and other functions of and on behalf of the intermediate unit or the school district provided that reimbursement for attendance at meetings called by the intermediate unit board of directors shall not exceed an average of four (4) per month per annum and provided that reimbursement for attendance at meetings called by the district board of directors shall not exceed an average of four (4) per month per annum.