Despite roaring back with a cracking plot, and a bunch of well-staged set pieces, “The Event” has made no impact ratings-wise since it’s return. And last night was no exception. It came even with last week’s low, scoring a 1.2 with adults 18-49. Ratings like this make cancellation likely. Too bad. This show has real promise. We fear that the overall low ratings of NBC are dragging this show down. And that on another network it might comfortably be heading to a second season.