[In Shakespeare's plays a "Clown" is typically ignorant, unsophisticated, and lower-class.]
Capulet gives the clown a list and tells him to go about and invite all the people on the list to Capulet's feast. As soon as Capulet is out of earshot, the clown exclaims, "Find them out whose names are written here!" (1.2.38). He can't read. Soon he sees a young gentleman who looks like he can read and asks him to read the list to him. The young gentleman turns out to be Romeo, and so Romeo discovers that the object of his love, Rosaline, is to be present at Capulet's feast.