that's way outside my knowledge base. Maryland is hosting, so a lot of the decision making about the event will be up to them. In general, schools like to hold scheduled events, though they have to follow the orders of state and regional leaders. Weather reports are generally iffy until the last 24-48 hours, so I doubt any decisions will be made before that timeframe.
As for postponed/rescheduled, that becomes an issue for the conference, and also between the schools to see if they have a date where both are free. I don't think there's a fixed rule about rescheduling.