THE PUBLIC SCHOOL is a school with no curriculum. At the moment, it operates as follows: first, classes are proposed by the public (I want to learn this or I want to teach this); then, people have the opportunity to sign up for the classes (I also want to learn that); finally, when enough people have expressed interest, the school finds a teacher and offers the class to those who signed up. (from their website)

currently only in LA, but I think they’ll spread this concept soon.

http://la.thepublicschool.org/