NJ trip

As I've mentioned, I am going to NJ for a two week training course starting 3/14, so 3/18 (evening) to 3/20 I'm hoping to be able to go to NJ and see people. ACat is flying into La Guardia Friday and Maedbh7 is planning on going directly to NY also on a bus. I'm trying to figure out how to get from NJ to NY in such a way as to meet up with them and whoever else might be around and interested. The hotel website is useless, but the fact that they don't have an airport shuttle suggests they aren't close enough to the airport to make that a good mass transit jump on option and NJ Transit website doesn't seem to be helping me figure out what's anywhere near Morristown, which is where the hotel is. Do any of the local/localish people have advice or websites or resources? All help appreciated - plus it would be good to know where/when/who might be in the catherding plans for the weekend!