There was a time, not so very long ago, when showing up late for a concert, an opera, or a play was no very big deal. You just made your dramatic solo entrance and allowed the room to focus on you rather than the stage for a minute (and for many latecomers, this was exactly the point.) But these days, especially in New York, the music is sacrosanct, and latecomers are seated at the discretion of the house. This is more complicated than it might seem. “Policies are surprisingly varied, and considerable thought is given to them. Some halls allow latecomers to stand in the back before proceeding to their places at a convenient break. Some let the artists pick an appropriate moment for late seating. Many halls provide audio and video during the wait, or a bar to pass the time (or ease the pain).”