I have no idea how to answer this question. If anyone knows, I'd appreciate it if you'd help meeee. Thanks :]

-Why is Louis XVI under pressure from the people of Paris?
-Why does Louis XVI call on representatives of the 1st and 2nd Estate to join the National Assembly on June 27, 1789?

There were more than one reason why Louis XVI was under pressure from the people of France. You are going to have to research this homework assignment on your own and come to your own conclusions.

See:
Louis XVI (http://www.wsu.edu:8080/~dee/REV/LOUISXVI.HTM)
http://www.angelfire.com/va/frenchrev/LouisXVI.html
The French Revolution (http://www.scribd.com/doc/42598/The-French-Revolution)