In Act 1, scene 2 of Romeo and Juliet, how does Benevolio convince Romeo to come along to the party?

Having heard the reason for Romeo's depression and general
love-sick attitude, Benvolio, desperate to try and cheer his friend up, tries to tempt
him to go to the Capulet's feast. However, the only thing that helps him to entice Romeo
along is the assurance that Romeo's lover, Rosaline, will be there, and that Benvolio
will show Romeo how there are so many more beautiful women at this feast than
Rosaline:

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At this same ancient feast of
Capulet's
Sups the fair Rosaline whom thou so
lovest,
With all the admired beauties of
Verona:
Go thither; and, with unattainted
eye,
Compare her face with some that I shall
show,
And I will make thee think thy swan a
crow.

Although
Romeo marks out Benvolio's hope as being impossible, at the same time he agrees to go to
the feast so that he can rejoice in the beauty of his lover and be near to her. It is
interesting though that, as important as Rosaline is in these first scenes, she never
appears at the banquet or indeed in the play as a whole, seeming to be included in the
play to show Romeo's swift change in his affections from Rosaline to
Juliet.