Before we headed out for WBC Robb found an online e-sports league that appears to be open to random schlubs like us. They appear to run a weekly single elimination bracket. I took a look at the lowest seeded match and it pitted a 2200 team against an 1100 team. (Somehow the worst seeded team was the 2200 one.) So while we'd certainly have no chance of winning the thing there are teams we could be competitive against!
One thing I discovered while reading their webpage is Riot apparently just added in a 'tournament code' feature to the custom game creation screen. The Go4LoL site generates numbers for each match which the players then enter into a box in the client. It shunts all the players for that match into the right game, reports the results for you, and verifies that only players on the right teams actually play the game. It sounds like a pretty sweet feature and I wonder if it works for other websites or if it's just a Go4LoL feature added to the client.
At any rate it looks like the first game each week starts at 3pm EST on Sunday. So the question is... Can we get 5 people willing to set an hour or two aside and join the Mathletes team?