The Capulet's are having another party/ He received an invitation.
Explanation:
Benvolio learns about the capulet party, while the family servant is delivering the invitations. This servant is illiterate and is very confused by the task he received, allowing Benvolio to easily take one of the invitations for himself. Because of this invitation, he calls Romeo to the Capulet party, where he can find a new girl and forget his old love.
