Forgive me, I beg you, from now on i'll do whatever you say.
In Act 4, scene 1, Friar gives Juliet a plan to get out of marrying Paris, giving her a vial that will give her a deathlike appearance telling her she would remain in that state for 42 hours sleep. This is important because this is what leads to Juliet's "death".
Act 4, scene 2 when Juliet was going along with the plan and begged for her father Capulet's forgiveness, giving her consent to marry Paris. This scene is important because it is apart of the plan for Juliet and Romeo to be together.
Act 4, scene 2, Capulet arranges for the wedding to be planned a day earlier than what it was originally supposed to be. It's important because this interferes with the plan that Juliet and Friar Lawrence have.
Romeo's servant reporting what he thought was truth information to Romeo. Important because it could cause great catastrophe.
When Friar John tells Friar Lawrence that the messages could not get delivered to Romeo. Important because him not saying anything could be dangerous.
Last scene, act 5... When the Montagues and the Capulet's put aside their differences and ended the feud. This is important because if they had of ended the feud earlier, their children would of never died.