When was the last time a Northeast team (Maryland and North) hosted a regional? All of the hosts are South or West. Plus, their new field whose only holds 3,500, sits on the otherside fo the river from the WVU campus where student live and is not even in Morgantown. Not sure I would consider West Virginia, which is more culturally a mix of Midwest and South than Northeast.
Last season Minnesota hosted a regional. Not in the northeast, but certainly northern.