PARTY IN THE FILM 'TITANIC'

In the film ‘Titanic’ there are two parties on a cruise. One of them is very, very formal, because it is only for people with lots of Money; and the other party is for the poor, because it is for people with little money but it is funny, because  people there dance, and in the formal one, they don't.They only eat expensive food.
The parties (obviously) are in two differents sectors: the party  for the poor is downhill and the other party is on the deck.