Runs from 5 to 100 miles along mainly single-track trails through Pinckney Recreation Area and beyond. Awards for top finishers. The 100 mile & 100K runs start at 2 p.m. on Friday, but most races start today. Overnight camping available, with live pop, rock, & Americana music on a stage at the camp on Friday by Jake Maltby and on Saturday by Stereo Babe, Easy Now, Spur 9, AJ Lynn Band, and the Fungi’s. Entry fee includes a finisher’s medal, post-race refreshments, concerts, and more. 6 a.m. (50-mile & 50K), 7:30 a.m. (26- and 13-mile), & 8 a.m. (5-mile), 20120 Bartell, Gregory. $25 (weekend pass), $29 (1-mile, kids dash), $52 (5-mile), and up to $295 (100-mile) at runwoodstock.com. (734) 929–9027, [email protected].