That party is a Capulet party. Romeo is not really in the mood to attend the party because Rosaline is going to be there, but she will keep ignoring him because she doesn’t like Romeo very much. He believes “some consequence yet hanging in the stars shall bitterly begin”(I.IV.). He is basically saying something bad will happen to me in the next few days if I were to attend this party. He ends up meeting Juliet for the very first time. Juliet and Romeo start loving each other so much from the very first time, they end up killing themselves for each. The consequence was basically them