Go here for details:
http://worldkayakblogs.com/throwdown/register/

We are really excited to be working with the NOC to host some great events this year at there, the home of the 2013 Freestyle World Championships! So come out and compete where the Pros will be going head to head in September. And come paddle with them on August 24th at the WorldKayak Pro-Am for First Descents! The first 2 events will be at the infamous Eternity Hole and then we move over to the NOC starting in June!