You know summer has fully arrived when fresh North Carolina (N.C.) watermelons are on the market. To celebrate these seasonal favorites, the Robert G. Shaw Piedmont Triad Farmers Market will host Watermelon Day on Friday, July 21, from 10 a.m. to 3 p.m. Visitors will be treated to free watermelon samples, giveaways and recipes, plus they can enjoy scavenger hunts, …