A new biking and walking trail is opening this weekend linking Mishawaka, South Bend, and Niles. The Trail Celebration and Grand Opening for the Indiana + Michigan River Valley Trail will be tomorrow at 9 a.m. in South Bend with two other ceremonies at 10:15 at the Fort and 3rd Streets Trailhead in Niles and the Niles Lakeland Trailhead on North St. Joseph Street at 11. The 34-mile trail has been decades in the making. The trail will have access to 16 parks, four universities, and five hospitals. Saturday’s ceremonies will happen rain, snow, or shine.