Last year's Amateur Magic Championship was at the San Diego Comic Con, and as it happens, so is this year's. Wizards just put the info up; click here to read about it.
Briefly, it's a Standard Constructed event starting at noon on Saturday at the Con. The entry fee is $10 (paid at the Hasbro booth), with a maximum of 140 players. The top-level prizes are a Dell laptop, some iPods, and boosters for the rest of the top 16.
So, is anyone feeling done enough with the con by Saturday to burn most of the day on this event? I'm not sure if I would be willing to do that.
The page also lists other Magic events being held at the Comic Con this year.