We will be in Vienna for a week in September (2017) and I just learned of this. I am quite sure we will want to attend one opera IN the opera house, but if there is a favorite we have already seen elsewhere, it might be fun to sit outside and watch it on the screen. Indeed my husband is such a fan I could see going every night they do that. ; )
So what is it like? Crowded? Do you sit on the ground or in chairs? Can one bring food/drink? How early should one arrive for the performance? Do they show every performance, or just certain ones?