The main crew, the Dazzlings, the Shadowbolts, and others all get invited to the CHS yearly dance. Everyone is there for about the same reason, but as the night goes on, their reasons change.
Each chapter focuses on a new set of people. Every chapter is about the same party, just from different view points.
Basically, find a couple you like and read about what they do, or try reading new ones, or read all of it...it's up to you.