Romeo desires to attend the Capulet party primarily for two reasons. Firstly, he is infatuated with Rosaline, a woman who does not return his affections. His friends, particularly Benvolio, encourage him to go to the party in hopes of helping him move on from Rosaline by introducing him to other women.
Secondly, unbeknownst to Romeo at the time, attending the Capulet party leads him to meet Juliet, the woman he ultimately falls deeply in love with. This chance encounter at the party sets in motion the events of the play, highlighting the themes of fate and the impulsive nature of young love. Thus, while his initial motivation is to distract himself from Rosaline, his attendance at the party becomes a pivotal moment that changes the course of his life.