I love this hall, however yesterday I went to the ...

I love this hall, however yesterday I went to the Vivaldi Four season s concert, and I was very disappointing. The concert started at 7:30. The first hour was the conductor teaching the audience the different parts of the piece. It was good for 20 min but one hour was a little too much. When I bought the tickets never told about this. The concert after the intermission (15min) was 25 minutes. And then Q&A for 15 min. Very disappointed.