Once you've registered, copy paste the Parkour Visions link in again, then go to Rate/Share and rate 5 stars. I think it's a worthy cause worth pursuing.
Parkour Visions has been featured before, btw., in connection with Globalgiving.
This particular contest looks really tough, though; very many worthy causes there...
There's an ongoing discussion among Parkour Communities, if the organizations should just focus on getting people out and move (already a valuable endeavor), or should be more socially active, as in the example of Parkour for the Children.