What I was thinking when I went to Gatsby's party

Earlier today I had been formally invited to one of my neighbor's infamous parties.  I took great pleasure knowing I was one of the only people that had actually received an invitation.  As a new resident of Long Island, I did not recognize any of the faces dancing wildy about Gatsby's garden until I stumbled upon Jordan Baker.  After sometime walking along with Jordan, we found ourselves sitting among many interesting people gossiping about Gatsby.  I, myself, had often wondered about that man, so I was began to listen intentively to what his guests were revealing about him.  Each guest seemed mysterious as well and the idea that he had killed a man had been introduced.  As the people continued blabbering about this idea, I began to question if it was true.  Why have I not even seen Gatsby?  Why does he appear mysterious to all  of his guests?  What could be the purpose of these parties and why was I invited?