Anyone who has driven on Interstate 95 north off Route 128 has viewed the classic bucolic scene as they head toward the northeast corner of Massachusetts: a large farm with twin silos and a huge “Alfalfa Farm” sign spanning them. Well, the sign is gone (though, word is, it will eventually return…) but the farm remains, and you may have wondered why there are suddenly so many people there these days. There’s good reason for it, as Alfalfa Farm, w…