http://www.summershakespeare.org/blog/

 At heart, the Shakespearean comedy is about a conflict between two opposite social groups (rulers and subjects, older and younger, wealthy and poor). The comedies tend to begin in a court in turmoil. Usually, this turmoil has arisen out of a crisis over marriage—the aristocrat female has refused to wed, or the laws of society forbid two young aristocrats to marry. The characters flee or are exiled, and they go from the court to a greener, less “civilized” world. They often choose (or are forced) to flee to a far-off exotic location, or a forest. Oftentimes, they are forced to don disguises. In this new place, far from the court that constrained them, they meet all sorts of other characters, and various plots intertwine. There are confusions and mistaken identities, but no major characters die. Central to these confusions is a topsy-turvy element in which society is flipped around: women are mistaken for men; servants end up ruling their masters; those who once chased find themselves pursued; and words are taken to mean their opposites. In this upheaval of the social order, the societal structure that once prevented the young lovers from marrying is transformed, and all the plots are resolved as the younger generation is brought back and welcomed to the court. The final act often includes a wedding and a celebration." with this text: "In this upheaval of the social order, the societal structure that once prevented marriage is transformed, and all the plots are resolved as those where were unable to marry are brought back and welcomed to the court. The final act often includes a wedding and a celebration.

 http://www.mccarter.org/education/twelfthnight/html/7.html