Caching or Security or File systems?

I'm new to this group and have not yet been to a meetup, but I would love to learn more about caching. Maybe it's a good icebreaker? I'd like to suggest meeting at the Cafe Racer in Ravenna (parking is easy, the food is great and the atmosphere is wonderful) Is anyone up for it? If caching doesn't capture your interest, I'm up for anything really. Security? I'm very interested in that along with file systems. Anyone? Also, I'm flexible on the date....Both Mondays and Tuesdays work well for the Racer as there is no live music those nights.