There are a variety of German programs that range from a few days of language training to full degree programs.
M.A. Programs in German
University of Illinois at Chicago
The Department of German has a M.A. and PhD program. Courses are regularly scheduled for evening hours.
http://www.uic.edu/depts/germ/german2.html
University of New Mexico: Die Deutsche Sommerschule
Students can earn a Master of Arts degree in German Studies, within four to five summer sessions, or two to three summer sessions in addition to course work taken on campus. Up to six hours of transfer credits may count toward the degree.
http://www.unm.edu/~fll/german/summerschool.html
Middlbury College Summer Program http://www.middlebury.edu
The Summer Language Schools offer a Master of Arts program in five of the languages (French, German, Italian, Russian, and Spanish)
http://www.middlebury.edu/academics/catalogs/catalog/about_midd/ls_sap.htm
Bowling Green State University Summer Program
BGSU's summer program in Salzburg, Austria runs in cooperation with the University of Salzburg and the Internationale Ferienkurse für Deutsche Sprache und Germanistik (IFK). Graduate courses offered. Contact program for M.A. options
http://www.bgsu.edu/departments/greal/summer/index.html
AATG Professional Development
A broad range of program options for teachers at all levels. Many programs take place in the summer.
GOLDEN (German On-Line Distance Education Network)
Looking for a convenient way to update your instructional skills and knowledge about the teaching and learning of German? The GOLDEN program allows to you to learn the latest instructional strategies and to integrate them directly into your German classroom via online professional development workshops.
http://www.aatg.org/programs/profdev/golden.html
And some more options from AATG...
http://www.aatg.org/programs/profdev/PDC.htm
http://www.aatg.org/programs/profdev/non-aatg-prog.htm
USA German Programs
http://www.germanistik.net/universities-us.htm
Goethe Institute Summer Programs
The Goethe Institute offers a broad range of special courses for teachers in the summer. German teachers are eligible to apply for special funding for these programs through the Goethe-Institut-Chicago.
Scholarship Application Deadline: Early November