The Committee of the Regions offers a limited number of traineeships for university graduates and local and regional authority staff.
Application form: DE - EN - FR
Link to check your status in the application procedure for the traineeship period 16/02/2015 - 15/07/2015: DE - EN - FR
Brussels-Europe Liaison Office
Traineeships Regulation 1996-2010.pdf
CoR departments explained.pdf