Niall,
I am not informed about John's schedule, but you can also contact Almut via
AlmutPercubassion@web.de . It should be of interest for German percussionists that an Irish conga player considers to travel and see John over here. I think it's a shame that the Munich workshop had to be cancelled for lack of participation, and the Hamburg date seems to be meager, too.
I have my own theory about - and attitude towards - the decline in popularity of Afro-Cuban percussion in Germany, and the reluctance of professional and advanced players to give room to further progress.
Although I am largely self-taught and had a lot of teachers along my way, I have to say that as a teacher, John has been my favorite, because he is always there for you, wouldn't hold back a single detail that might help you, and has no inclination to self-aggrandizement (like so many others). I saw him perform in a rumba setting, which convinced me totally of his musicality. I love his warm tone and no-nonsense, old school style of playing. Plus, I'm happy to call him a friend after all these years. In this respect, I second Geordie's notion.
Thomas