DULUTH — The 48th running of Grandma's Marathon starts at Sonju in Two Harbors and concludes in Duluth's Canal Park. In between, the 26.2-mile course makes its way along Minnesota's North Shore on Scenic Highway 61, it passes through Duluth's Lakeside-Lester Park, Congdon, Endion neighborhoods via London Road and runs through the East Hillside and downtown on Superior Street. The 2024 course does feature a tweak that will mostly impact spectato…