Dork diaries 2: Party Time. Rachel Renée Russell. 2010.

Take two parties, add a couple of friends and one crush, sprinkle with one mean girl, mix well, put fingers over eyes and cringe! 

Nikki Maxwell is finally adjusting to life at her new school: she has made some real friends, and her major crush, Brandon, has even asked to be her science partner - a seriously awesome development.

But when Nikki overhears mean girl Mackenzie bragging about going to the Halloween dance sign Brandon, she’s gutted and decides to go to her little sister’s party instead. Then she discovers Mackenzie was lying. Could her dream of going to the party with Brandon still come true?