NORTHSTAR, Calif. — Placer County and the Northstar Community Services District will celebrate the completion of a new segment of the Martis Valley Trail with a public ribbon-cutting ceremony on Wednesday, June 3, starting at 12 p.m. at the new trailhead near the Northstar Preferred Parking Lot. The completion of Segment 3F closes the mile-long gap between Northstar’s Castle Peak parking lots and Northstar Village, further expanding the paved Cl…