Why isn't Gatsby's at his own party?

Gatsby isn't at his own party because he feels isolated despite hosting lavish gatherings. He often stands apart from the festivities, longing for the presence of Daisy Buchanan, the woman he loves, who represents his unattainable dreams. His absence reflects his deeper emotional struggles and disconnection from the superficiality of the world around him, highlighting his desire for genuine connection rather than mere social interaction.