ONLINE ENTRY OPEN FOR HALF MARY, FULL MARY & 50-MILE RACES Woohoo! Visit the race page for the March 19 inaugural Pi Day River Rotation Half Marathon and sign up now. Online entry open, but will probably fill up fast, what with the homemade pies that will be served. Also now taking entrants -- the 2nd annual Hawk 50-Mile & Marathon Trail Runs, set for May 21. Start training now -- these races will be here before you know it.