The Legal Profession Group meeting will be in Königswinter-Heisterbacherrott, a place very close to Bonn from the 1st to the 4th of July.
This is the website of the venue:
There will be a package including three nights (from Sunday evening till Wednesday).
Bonn is close to several airports: Cologne/Bonn which is in the proximity, Düsseldorf which is 1 hour by train, Frankfort an hour to two according to the type of train, and also Brussels is not very far (app. 3 hours).