YC used to spend half the year based out of Cambridge, MA before they decided to concentrate exclusively on the west coast, so no, it isn't the first time they're heading east.
My bad. I'm new to the east coast (been here a little over a year) and PG said something like this was YC's first NYC event at YCNYC, so I reached an incorrect conclusion. Should have said something like this was their first time back in awhile I suppose.
