Here we can see a Butler, that is being employed by Mr. Gastby, delivering an invitation to Mr. Gastby next party. This is unusual since nobody is really invited to Gatsby's parties, people just show up.
Mr. Gastby is inviting you to his next party.
Thank you! Please confirm my assistance with Gatsby.
We can see Nick approaching Gatsby's mansion. He is astonished by the huge mansion. He also notices the number of people that there is to be seen all around; and the extravagance of the party.
This place is huge. There are huge amounts of people present.
Have you seen Mr. Gatsby? He invited me to the party; he sent his butler with an invitation letter.
Nick was looking around for Gatsby since he was invited to the party by him. After asking around for some time, he encountered himself with, The Great Gatsby.