Runners from around the world will lace up their sneakers and descend on the tiny town of Viola next weekend.Registration continues for the fourth annual Viola Valley Half Marathon, which is set to take place Saturday, May 16. The race starts at 7 a.m. and features a scenic 13.1-mile course that travels the rural roads of three counties – Warren, Grundy and Coffee.“This year Viola will have a bit of international participation as runners from Mexico and Japan have registered,” said organizer John Nunley. “This year’s registration is going much like the previous two years.