The "Big East" Primaries on March 1 are Massachusetts, Vermont, Minnesota (I told you it wasn't perfect), and Democrats Abroad.
I am calling that Senator Sanders will win all four of these contests. Minnesota and Massachusetts will be close, Vermont will be a blowout, and who knows about Democrats Abroad, really, though I figure those sort of folks probably skew fairly left.
I am predicting that Sanders will claim 58% of the delegates in these states, giving him a Big East margin of roughly 150 to 100 for Clinton.
As for Nate Silver's famous "benchmarks for a Sanders nomination", I only see Sanders hitting that in Vermont. Maybe in Massachusetts. Maybe in Minnesota. If he does hit three benchmarks in this region it will have been a big night for him. Because the other two regions on March 1, "The Big XII" and the "SEC" do not look nearly as good for him as this region.
UPDATE: I am changing my call on Massachusetts. Clinton wins Massachusetts narrowly, and splits the delegates for that state at about a 55/45 rate.