What kind of people attend Gatsby's parties?

Gatsby's parties are filled with guests, most uninvited. None-the less, many of Gatsby's guests were well known.... some were politicians, others from wealthy families, and still others from all walks of life.

From West Egg came the Poles and the Mulreadys and Cecil Roebuck and Cecil Schoen and Gulick the State senator and Newton Orchid, who controlled Films Par Excellence, and Eckhaust and Clyde Cohen and Don S. Schwartze (the son) and Arthur McCarty, all connected with the movies in one way or another.

Gatsby's guests were fun loving and without inhibition. His mansion was a place to party.