The Four Corners Grange invites valley residents to honor the area’s agricultural heritage during the grand opening of Prairie Sky Commercial Center this Saturday. The program includes a tractor pull demonstration in the former hay field now designated for additional parking, a pie contest judged by developers from Bozeman, and a ceremonial ribbon cutting using baling twine. Organizers say the event captures the spirit of a community that remembers when Four Corners was four corners. Free hot dogs provided by the new national sandwich franchise anchoring the development. The baling twine is biodegradable.