Not sure of your level of love for racing, but if you are interested there is a USAC Midget Race in Hanford on Saturday Night. I might be flying down there from Napa and back. An Engineer from Stewart Haas, who used to race for me, is coming in for the weekend it appears he is going to be racing that night in a midget and I have offered to fly him from Napa to Hanford and back that day/night.
Also on Sunday after the NASCAR race, Petaluma Speedway (3/8th mile dirt oval) is running a special Sunday night show. We will have one of our cars racing that night as well (at least it appears that way right now).
Other local shows on Saturday night that are close to Sonoma would include Antioch Speedway, they are running a $2500 to win Mod race and a $2000 to win Late Model race. It has not been unheard of for the likes of Ken Schrader to show up at that race.
Other race tracks running over the weekend within a short flight would be Silver Dollar Speedway in Chico, CA (Friday) and Placerville Speedway in Placerville, CA(Saturday). Both tracks are dirt and feature sprint cars, with crate late models on the undercard. If you are interested in any of these shows let me know, I can help you with logistics.