I rode through this morning on my commute and the streets were closed to cars while they setup. The Sac PD manning the barricade said that once the event starts they're going to close the streets off to bikes as well. Just an FYI.
In the even that he was mistaken and they leave it open to bikes, all of the streets are covered in 1-3" of sand/dirt with some areas much deeper. So be careful out there, I definitely hit a few dicey spots on my 25s this morning.