Hey! I am SOO EXCITED about this book!
The titles become self-explanatory but here is a breakdown of the chapter by year in case you want to skip to a certain year. The story mostly focuses on the summers but as the storyline changes according to this story at Hogwarts, I'll be sure to include it.
Also, this isn't strictly just the events, there's obviously a bit of bonding and fluff and angst and so on.
I'll update as the chapters come along!
THIRD YEAR (Prisoner of Azkaban):
Red Room
Chapters 1-18 + Third Year Recap
FOURTH YEAR (Goblet of Fire):
Kate & Hailey adventures, Age of Ultron
Chapters 19- ongoing + Fourth Year Recap