Randolph, Massachusetts - Dunkin' Donuts said it is targeting young adults through a music-themed summer promotion highlighting its warm-weather beverages. The promotion will feature the more-than-5,500-unit doughnut chain's new Lemonade Coolatta. As part of the promotion, running through July 15, Dunkin' Donuts is teaming up with MTV for a sweepstakes where one grand-prize winner and 10 friends will receive a prize package including a private summer tour to three concerts. -Nation's Restaurant News