For those interested, the next Greenberg Train Show will be at the Shriner's Auditorium in Wilmington, MA this Saturday and Sunday - March 23 and 24. It is Exit 39 off Interstate Route 93.
Not a "huge" O Gauge presence, but usually one or two layouts and several vendors and a good show for the kids with a large Lego layout and a train ride.
Link attached - http://greenbergshows.com/