The main reason for the Kyoto 250/500 practices was because of the seriously majorly bad consequences of the equation
n00bs + oval = MOST EPIC FAIL EVER
That risk isn't that much of an issue in this event, and it's designed to be a relatively 'informal event'. I.e., we've dropped the usual entry requirements, we're not using car numbers... etc.
Although I would have nothing against doing few practices.