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The first day of spring is Sunday, March 20, and two establishments will offer freebies to celebrate. Rita’s Italian Ice stores will again celebrate the first day of spring — as they do every year — by giving away their namesake product. But instead of limiting the freebie to a single day, Rita’s now extends it for a full week, March 20-27. The gratis free treat comes in a 7-ounce limited-edition…