In the book The Great Gatsby where is gatsby when nick speaks with him for the first time?

They are at one of Gatsby's parties in Chapter 3. Nick mistakes Gatsby as one of the attendees of the party, until Nick asks, where the host is. Gatsby announces himself as the host and startles nick. The specifics of their location would be at a small table. Nick was with Jordan and her friends at a small table when "a man about [Nicks'] age" asks Nick about his time in the military. The man happens to be Gatsby.