I picked up a flyer recently. It is on Sat Oct 18 from 9:00-3:00 and the CHP Academy, 3500 Reed Ave, West Sacramento. Reg fee is $20, must pre-register, deadline to register is 10-10-03, limited to 700 cars. For add'l info call: Tim Maley 916-657-8810.
I've attended the last 3 years (looking only, not showing yet) and it is a nice show. Good variety of rods, muscle cars, etc. CHP also has demo's going on at their adjacent high-pursuit training track.
I think there is a "Cops & Rodders" show sometime in Scotts Valley (Santa Cruz Area), but I haven't seen a flyer yet this year. Last year the cops provided "parade status" to the participants. They led the group down Hwy 1 with the red lights a goin'.