How does Romeo find out about the Capulet party?

In Act I, Scene II of "Romeo and Juliet," Romeo finds out about the Capulet party from a servant who is unable to read the list of guests and asks Romeo to help him. This encounter leads to Romeo's decision to attend the party, which sets off the events of the play.

The servant first meets Romeo outside of the Capulet household and asks for his help in reading the names on the list of guests. Romeo obliges, and as he reads the list, he discovers that Rosaline, the woman he is pining for, will be attending the party.

In this scene, Shakespeare uses wordplay to show how Romeo's feelings towards Rosaline shift. At first, he is moping about his unrequited love, saying "Here's much to do with hate but more with love" (I.ii.169). But as soon as he learns that Rosaline will be at the party, he changes his tune and eagerly accepts the invitation, saying, "I'll go along, no such sight to be shown, but to rejoice in splendor of mine own" (I.ii.106-107).

This scene not only introduces Romeo's character and his motivation for attending the Capulet party, but it also establishes the central conflict of the play: the feud between the Capulet and Montague families. By attending the party, Romeo is putting himself in danger by going into enemy territory, which ultimately leads to the tragic ending of the play.

Overall, Romeo's discovery of the Capulet party through the servant's inability to read the guest list is a crucial turning point in the play, setting off the events that lead to the tragic end of the story.