Big Dipper All-You-Can-Eat Ice Cream Festival 2010 Raffle, food tent, face painting, moonwalks, games, free hearing and vision checks, fingerprinting and photo IDs for children, puppy patting at the NEADS table, clowns, mascots, celebrity scoopers, balloons, Polar Beverage sampling and more. Appearances by U.S. Sen. Scott Brown and performance by “American Idol” finalist Ayla Brown, 10:30 a.m.-5 …