Well, they used to. But the indoor track that the New Hampshire Karting Association once ran some Winter events at closed down a few years back. So they are not doing that presently. I think they tried another place in Western MA, but nothing came of it.
Either way, the events there were not Wheel-2-Wheel races, but in a Time Trial format. The karts, even World Formulas, were too fast for that particular indoor track to have multiple karts racing each other at the same time.