C5 is challenging you to a half marathon. Join the C5 Half Marathon on May 27, 2012 at F. ORtigas Road. You can register forthe 3K, 5K, 10K, 15K, 21K. C5 Half Marathon 2012 May 27, 2012 F. Ortigas Jr Road (Formerly Emerald Ave.) EVENT DISTANCES 3K, 5K, 10K,...