The Akko Opera festival takes place on 2nd and 4th August. It features a special production of Gluck’s Orfeo ed Euridice. And on Thursday 9 Aug, the Tel Aviv municipality is hosting a performance of Verdi’s Nabucco in Hayarkon Park. Admission is free.
http://www.israel-opera.co.il/eng/?CategoryID=794&ArticleID=2892