I'm assuming you've read the novel, so my references to events will be just that--short, quick references.

• The frame (beginning and end) - Gene comes back to Devon school and re-examines the events of those years
• Summer school and the Suicide Society
• Finny and Gene do all sorts of things (beach, blitzball, etc.) but not much schoolwork
• Gene comes to the erroneous conclusion that Finny wants Gene to fail
• Gene jounces the limb and Finny falls
• Before school begins again in the fall, Gene tries to confess but Finny refuses to hear him
• Gene wastes his athletic abilities on being a manager; he and Brinker decide to enlist
• Finny stays home until Thanksgiving, then returns.  Gene's plans to enlist evaporate
• Training for the Olympics, Winter Carnival, and note from Leper
• Gene visits Leper and is faced with his guilt by a rather crazy Leper who has gone AWOL
• Finny now denying the war even exists
• Brinker conductsa mock trial which reveals Gene's guilt and Finny's doubts; Leper testifies
• Finny falls and is taken to the infirmary
• Gene tries to apologize to Finny but is rebuffed
• Gene returns to the infirmary and is able to have a lucid and reconciliation moment with Finny
• Gene finds out Finny has died
• Brinker's dad comes and presents an idealized view of war and serving in the military; Brinker is angry and disillusioned
• Back to the framed story and a pensive Gene--who enlisted but never really had to fight