Oberlin Gaming and Roleplaying Establishment (O.G.R.E) - Mad props to AB.
Matrix Games - An incredibly awesome alumni-owned gaming shop in downtown Oberlin.
Cleveland By Night - runs on non-UnMasqued Friday nights
Smoke and Mirrors - While it's not in the area, this spiffy Evanston LARP (set in New Orleans) makes use of UnMasqued house rules and source material
One World By Night - Network LARPs
Carpe Noctum - runs on the Saturdays immediately following UnMasqued