In F. Scott Fitzgerald's "The Great Gatsby," Gatsby measured the success of his party by whether or not Daisy Buchanan attended it, and whether or not she enjoyed it. Gatsby threw his parties to impress her.
Daisy was the sole reason Gatsby threw these lavish parties. If she did not like the event, Gatsby considered it a failure. He especially considered it a failure if Daisy did not attend. If she wasn't there, Gatsby saw no reason at all in throwing the party.
Gatsby often asked Nick if he thought Daisy would favor the parties he threw, even before Daisy arrived. By organizing these extravagant events, Gatsby had the chance to show Daisy all of his wealth and success. He thought this would make her fall in love with him again.
At the party Daisy does attend, Gatsby finds out she is actually bored. Therefore, he is disappointed and does not like his own party. Daisy does not enjoy being around people from West Egg. She admits the party is too fancy for her, and that she is happiest when she is alone with Gatsby. It turns out none of his parties were an actual success, since none of them ever impressed the object of his attention, Daisy.