What are important events in Chapters 3 and 4 of The Great Gatsby?

Chapters three and four in The Great Gatsby by F. Scott Fitzgerald are important because they provide detailed insights into the glamorous life of the mysterious Jay Gatsby.

In chapter three, an invitation to Gatsby's party is delivered to Nick Carraway and Nick attends the party. Nick witnesses the luxurious interior of Gatsby's mansion as well as all the glamorous decorations and food Gatsby has at his lively party. Most importantly, Nick has the great pleasure...

Chapters three and four in The Great Gatsby by F. Scott Fitzgerald are important because they provide detailed insights into the glamorous life of the mysterious Jay Gatsby.

In chapter three, an invitation to Gatsby's party is delivered to Nick Carraway and Nick attends the party. Nick witnesses the luxurious interior of Gatsby's mansion as well as all the glamorous decorations and food Gatsby has at his lively party. Most importantly, Nick has the great pleasure to meet the mysterious Jay Gatsby for the first time. Up until this point, both Nick and the reader have only observed Gatsby from a distance, so it is notable that he is finally introduced formally. 

In chapter four, Gatsby and Nick take a trip into the city and Gatsby reveals many aspects of his luxurious life. During their trip, Nick finds out from Jordan (one of Daisy's friends) that Gatsby is in love with Daisy Buchanan—so much so that he bought his giant mansion in order to be close to her. This is an important development in the story because Daisy and Gatsby's love is a driving source of conflict for the rest of the novel.