Hope to see people there this weekend.

according to the reddit user uColonel (the builder), this thing is a MIDI keyboard:
quote from the builder:He said that he cut the bottoms out of Cherry MX blues, then put tactile switches under each one on another PCB. The stem from the blues then actuate the underlying layer and give a "sensing" effect where the PC can find out how far down the switch has been pressed.
It is a very interesting new use of cherry switches.Hello, I am the guy behind this. It started as a project at LVL1 Hackerspace out of a custom music equipment group we started. This is an isomorphic keyboard we designed, using modded Cherry MX switches and sandwiched PCBs to get a velocity-sensitive keyboard. I.e. it's a keyboard where the harder (faster) you press the key, the louder the corresponding MIDI note message (1-128 value range). Here's an older wiki entry of ours describing how this works: http://wiki.lvl1.org/Isomorphic_Keyboard