DUNKIN’ DONUTS: has renewed its sponsorship agreement with the 17-time World Champion Boston Celtics.The three-year extension, which will focus on community and promotional initiatives, will run through the 2012-13 National Basketball Association season. The company has also named Celtics All-Star guard Ray Allen as a spokesperson to be fully-integrated into the new season-long Iced Coffee marketing campaign, “Caught Cold.” Allen will be featured in television and radio commercials and participate in promotional appearances.