Pritzker Pavilion in Millennium Park is one of our favorite places in the entire city, but others seem to like it just as much, or at least, take full advantage of all the great free events that are available there each summer. As a result, free events at the pavilion can be crowded and a little bit hellish. Happily, this was not the case at last Friday’s performance of Don Giovanni, Chicago’s first-ever, live simulcast......