A massive snowstorm that the National Weather Service is calling “potentially historic” threatens to dump 20 to 30 inches of snow on New York City from Monday night into Tuesday — just as the Inman News Real Estate Connect conference kicks off at the Marriott Marquis hotel in Times Square on Tuesday morning. But despite the blizzard’s guarantee to cripple travel plans — the potential exists for NYC’s three major area airports to shut down by Monday night, as well as the city’s subway system, officials say — the conference, which will feature heavy hitters such as keynote speaker Rupert Murdoch, will go on as planned.