In Act IV, scenes iii-v of Romeo and Juliet, Juliet’s parents contribute to the catastrophe primarily by pushing Juliet into a quick marriage with Paris.
In this section of the play, Lord Capulet insists on arranging the wedding to Paris without considering Juliet's feelings or her secret marriage to Romeo. This urgency and pressure from her parents lead Juliet to take drastic measures to avoid the marriage, ultimately resulting in tragic consequences. Their insistence on the wedding creates the circumstances for misunderstanding and miscommunication that contribute to the play’s tragic ending.