This trimester I began an Esperanto course for 8 students at our private high school. Seattle Academy is an independent school with about 600 students (350 in our high school). The course is structured as "independent study" class although I have students meet together during the regular school day. As such, it is not graded -- students earn credit for 50 hours of work. This is the standard format for non-established course in a school.
The North American Summer Esperanto Course (NASK) is among the most well-known and prestigious Esperanto immersion programs. This year, NASK will be returning to the west coast, to the University of California-San Diego in La Jolla, CA, from July 9th to July 27th. For more information, you can visit http://esperanto.org/nask/index.html.
