Yes, Prinzenrolle is a kind of biscuit, welknown at least in Germany and easy to recognize.
Area 2-510 is used for conferences and presentations.
Usually lot of people are in this area, hard to meet someone, you never saw before.
Follow the Prinzenrolle, and you have a good chance.
I'm curious if anyone will come ;-)
Some big companies(ST,Xilinc, etc) pulled out, so lets wait and see.