The National Watermelon Promotion Board (NWPB) invites all retail chains, independent retailers and commissaries to submit entries to their 15th annual Watermelon Retail Merchandising Contest. More than $10,000 in cash and prizes will be awarded to top entrants, including $5,000 for the grand prize for winner. The second place winner will receive $2,500, third place will receive $1,000 and three honorable …