The teams behind “One Chicago” had another successful crossover this week — and it wasn’t an easy one to produce. “ Chicago Fire ,” which kicked off the three-hour event on March 4, drew 6.3 million total viewers on NBC, with “ Chicago Med ” following with 6.4 million and “ Chicago P.D. ” closing out with 6.1 million. Each show hit season highs, and the best numbers the franchise has seen in over a year. They also don’t include streaming viewers on Peacock. David Zaslav Sells $114 Million Worth