Pre-Halloween snow last fall turned many of Maine high schools’ grass athletic fields into slippery, muddy messes by the time the soccer playoffs began. That left some Aroostook County teams scrambling for alternate sites with artificial turf, and that made Mark White a busy man. “Just a little bit of snow and/or rain will make [fields] unplayable, so those of us with [artificial] turf fields end up hosting playoff games for teams that can’t get on their fields,” said White, the Presque Isle athletic director who oversees the Gehrig T.