You may have heard of Intercons such as Intercon Mid-Atlantic, and Intercon NorthEasts, and even Intercons with numbers after them. Those are Intercons that happened outside the New England area. They were loads of fun, but sadly, all of them are currently defunct.
New England Interactive Literature (NEIL) is the group of volunteers that brings you the New England Intercons.
The Live Action RolePlayers Association (LARPA) owns the Intercon trademark.