The question as worded is difficult to tackle. First, the term "main events" is not an accurate literary expression. Secondly, "all" is a little daunting. So let me limit my response to those events that set the plot and move it forward. The exposition (what had gone before the plot begins) unfolds gradually--Pip's present circumstance, being an orphan, etc. The first important event is his bringing food to the prisoner, Abel,not just the file. This event begins the present plot. The next important event is Miss Haversham's invitation (command, actually) for Pip to come to her. There several sub-actions set up the plot's development: meeting Estella, socking Herbert Pockets, who becomes his friend, and of couse the beginning of Miss Haversham's plot. The next important moment is the news of his secret benefactor, leading to his London experiences (and all the subplots of his becoming a gentleman.) The novel reaches its climax at the discovery that the prisoner Abel is the benefactor. His recapture and death begins the denouement, which climaxes at the burning of Mrs. Haversham. The final closing is his reuniting with Estella, and his return to the foundry and his family. These, to my mind, are the "main events."