Dvorak Motors is right in the middle of their Rock and Roll sales event at 1102 Airport Road in Bismarck.Join HOT 975 live as we rock to the sounds of the Highway Six band tonight after 6 p.m., enjoy the beer gardens and bring out your friends out to the street dance. Tomorrow Dvorak Motors host their "Show and Shine" car competition from 11 a.m.-3 p.m., followed by the stereo competition at 3 p.m. tomorrow- up for grabs cash prizes from $500- $4000 (prizes will be awarded as Dvorak Motors Pro Shop certificates).The Main Bar will run the beer garden tomorrow night to benefit the Freedom Riders Motorcycle club.