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<SIA.Dork Diaries: Tales from a Not-So-Popular Party Girl (also known as Party Time) is the 2nd book in the Dork Diaries series. It was released on June 8, 2010.
Nikki Maxwell is hoping her crush, Brandon Roberts, will ask her to the Halloween dance. But she is heartbroken when she overhears her nemesis, MacKenzie Hollister, bragging that she and Brandon last night. Having nothing better to do on the night of the dance, Nikki reluctantly agrees to serve on the dance clean-up committee with her best friends, Chloe Garcia and Zoey Franklin, as well as help out at a ballet class Halloween party for her little sister, Brianna.
Nikki is shocked when Brandon asks her to at the dance and realizes that MacKenzie was lying. However, in spite of her prior commitments, Nikki agrees to go with him and ends up spending the evening juggling three events at the same time.
- Chloe and Zoey wanted to go to the Dance in plastic trash bag costumes.
- Nikki went to the ball in her mother's Juliet costume.
- Brianna's Halloween Party took place in the zoo.
- MacKenzie invited the entire school (including Nikki, Chloe and Zoey) to her party.