Why would shakespeare add a silly scene before romeo and juliets marriage?

Shakespeare often did this as a comedic relief. They women in the audience back then wore the tight tops and too much of a stressful, tense, scary, lovely, whatever emotion would often cause the women to faint. Shakespeare's solution to this issue was to provide a comedic relief to his audience.

Riffin tells a story about photographing elephants in a wildlife sanctuary in africa. he says that the photographer brought back more than just an amazing story.

That is true  i hope that : )