Bring something you're working on and want to chat about, or just bring an inquisitive disposition. For now we're sticking with an unstructured salon approach.
Oleg suggested last time that we introduce a problem at our next meeting and then we can share and discuss solutions at the following meeting. I thought that sounded like an entertaining idea. He had some thoughts on big-data problems that would be interesting to pursue, but I think we're open to other suggestions as well.