Appeal from Person Aggrieved, MGL Ch. 40-a, S.8 and S. 15 appeal from Building Commissioner determination regarding outdoor entertainment (inclusive of indoor entertainment not wholly within an enclosed building) not comprising any change or substantial extension under M.G.L. c 40A, Section 6 (ii) interpretation of “discontinuance” and (iii) failure to require compliance with Zoning Bylaw Section 235 - 6.7.