How does Romeo appear to Juliet in her vision the morning after he spends the night with her?

Standing in the orchard below her window, Romeo promises Juliet that they will see one another again, but Juliet responds that he appears pale, as one dead in the bottom of a tomb. Romeo answers that, to him, she appears the same way, and that it is only sorrow that makes them both look pale.

he will find out what went wrong or happened and how.

well stockyards mean a large yard containing pens and sheds, typically adjacent to a slaughterhouse, in which livestock is kept and sorted. and i'm assuming that by party you   mean a large group of people which does make sense because chicago is a very crowded place much like new york. stockyards tend to take up a lot of room due to needing the area for pens to keep animals in and the fact that stockyards are usually right by slaughterhouse where they process and distribute the product. so its much like a zoo but with some dead animal products close by.