During their conversation, we learn that Tybalt has sent Romeo a challenge to a duel. Benvolio and Mercutio discuss Romeo's recent strange behavior, specifically his newfound infatuation with Juliet. This conversation sets the stage for the escalation of conflict and foreshadows the tragic events that will unfold.
benvolio
Benvolio isn't more important than Mercutio. Benvolio is a good friend to Romeo (Benvolio sort of means 'well-meaning' in street-Italian), but he doesn't make much difference to the plot. Mercutio picks the fight with Tybalt that turns this from a lovestory into a tragedy. Benvolio tries to joke Romeo out of his pash on Rosaline, tries to persuade Mercutio not to fight Tybalt, tries to get the Duke not to banish Romeo - but nobody ever listens to Mercutio. A nice fellow - but not a lot of use to anybody.
Romeo's comical friend was called mercutio
In Act 3 Scene 1 Benvolio is nervous, Mercutio is careless.
Benvolio tells Mercutio to retire because he senses a brewing confrontation between Mercutio and Tybalt, and wants to avoid any violence. Benvolio is concerned for their safety and tries to diffuse the situation by suggesting they leave.
He doesn't. Mercutio is not in that scene, and Benvolio and Romeo do not part company.
Benvolio and Romeo went to the Capulets' party with Mercutio and other friends.
Benvolio serves as a foil for Mercutio because Benvolio is calm, level-headed, and seeks to avoid conflict, while Mercutio is impulsive, hot-tempered, and enjoys provoking others. This contrast highlights Mercutio's more extreme characteristics and adds depth to their relationship.
Benvolio is asking Mercutio to go home before the Capulets arrive and a fight breaks out in Verona's streets.
Friar Laurence
Benvolio and Tybalt was there at the scene with Romeo when Mercutio was stabbed; then died.
Romeo accompanied Mercutio and Benvolio to the Capulet's feast.