I dont know whether this will become a "TT event" or not, but at the moment I am going by myself so I thought I would invite some TTers to join me. You can read about it here:
http://www.chiemsee-reggae.de/english/
I have decided to go for the whole experience and camp there even though I only live 15 minutes away, as the 70€ 3 day ticket includes camping for free. Alternatively you can buy single day tickets at 42€.
Its actually one of Europes major Reggae events, so it should be a good time down there in the sun near Lake Chiemsee.
Let us know if you are keen to come along.