AND OFF THE STAGE? Souped-up automobiles, a pin-up pageant, and rockabilly raucousness rule the Ventura Fairgrounds. We're not sure if someone will drive up in Johnny Cash's Mercedes Benz , which went up for sale in Ventura in January, but you can bet that the cars'll be plenty vintage and plenty loved-on, with oodles of craftsmanship and tender care on display. Also much on display? Wayback fashion, from Brylcreemed pompadours to parasols to ladies rocking the Bettie Page bangs. Roadshow Revival is both a tribute to the Man in Black and one of the alt-country-iest, rockabilly-nicest gatherings in all the West, and it continues to grow. Want tickets? Get 'em now, for $35.