Celtic to play 5 fans in coffee challenge

Five basketball fans will get to shoot hoops with Celtics All-Star guard Ray Allen today as part of a promotional campaign. Allen, along with Celtics dancers and team mascot Lucky the Leprechaun, is slated to appear at the Dunkin’ Donuts at 130 Lexington St. in Waltham at 2 p.m. and will challenge five fans spotted with an iced coffee to a game of Knockout. Winners will receive two tickets to tomorrow’s Celtics home opener against the Miami Heat and the opportunity to appear in a television ad campaign for iced coffee.