GREENSBORO – To celebrate the bounty of local produce and N.C. food products, the Robert G. Shaw Piedmont Triad Farmers Market is hosting its fun-filled Summer Fest July 12 complete with kids’ activities, grilling demonstrations, plus free samples for guests.This time of year, the variety of N.C. produce is as colorful as confetti, and visitors can come enjoy free watermelon slices, free peach samples, free tomato sandwiches and free corn recipe cards from 11 a.m. to 2 p.m.