explain how gatsby's parties were like his funeral

Basically Gatsby was irrelevant in the scheme of things by the people who went to his parties or his funeral. Gatsby remained isolated from people, from his Daisy in life and death. Check out this GradeSaver link,

http://www.gradesaver.com/the-great-gatsby/q-and-a/who-attended-gatsbys-funeral-how-and-why-is-this-signifcant-70105/