I will ask some people I know if they want to stop by. Also, we should talk to 7bit if he can organize an empty apartment for the keyboard meet-up. Alternatively, I could organize a clubhouse for rent. Decently cheap, prob like 5-10 euro per person tops.
Have any more details been arranged?
Without a definite plan, it's always easy to get distracted by other opportunities in Berlin... especially on a summer weekend.