Because it's new england. The weather likes to just screw with us. It gives us that one or two really nice, awesome days then it takes them away and gives us three more weeks of freezing rain and snow.
I talked to Matt last night. He said they're open saturday and sunday so I would assume the field is open as well. Then again, Matt only knows what's going on at the store and not the field so perhaps he's not the most reliable source for field related info. I'll have to bug Demaine.