Tuesday’s Nor’easter dumped up to three feet of snow on western parts of Massachusetts, but Boston mostly received rain and wind. Meanwhile, Northeastern leaders returned from Accra, Ghana, where the university held its fifth Global Leadership Summit. Close to 300 people, including top Ghanaian civic and business leaders, convened at Kempinski Gold Coast Hotel from March 9-11. The intergenerational audience included alumni, students, parents, faculty and friends from around the world.