The world as we know it has ended. The woods are now crawling with zombies and chainsaw-wielding madmen. There's a feeling of dreadful chaos in the air. This is the scenario presented by Day of the Running Dead, a 5K cross-country adventure laced with the threat of zombie attacks. Piles of hay bales, rope ladders, mud pits, and other obstacles along the course add a special challenge for those immune to the zombies' tricks or extra-afraid of dirt. So do the costumes that runners are encouraged to wear. Those who survive are invited to an after-party featuring food, drinks, music, and prizes for the top 10 costumes.