Tybalt, the kinsman to old Capulet, Hath sent a letter to his father's house.
Act 2 Scene 6
Come, come with me, and we will make short work...Till Holy Church incorporate two in one
Because Romeo was enchanted by Juliet, he went out looking for her. During their meeting, Romeo and Juliet confess their love to each other. Romeo tells Juliet that he wants to marry her and Juliet happily agrees. They agree that they will get married in the morning.
The morning after the party at the Capulets, Benvolio and Mercutio go looking for Romeo. While searching, Benvolio tells Mercutio that Tybalt had sent Romeo a letter. It was a letter challenging Romeo to a duel. Mercutio and Benvolio both know that Romeo will accept the challenge.
As promised from their meeting earlier, Romeo and Friar Lawrence await for Juliet to arrive. Juliet arrives and goes to Romeo, where the two of them rejoice in being with each other. Friar Lawrence tells them to hurry so he can marry them.