That's as in the Magic Marketplace trade show, where local retailers and apparel makers are peddling their latest wares and assessing their back-to-school seasons. Huntington Beach-based Quiksilver Inc. said that a hot summer helped jump-start sales of casual/surf appeal. The Quicksilver results ease earlier concerns about the action sports sector after Anaheim-based Pacific Sunwear of California reported a large drop in its second-quarter profit.