More than a year ago, a group of Italian-Americans in Stamford fought to preserve a statue of Christopher Columbus in the downtown. On Sunday, they’ll celebrate that the statue is still standing. The Stamford chapter of the Italian-American service organization Unico is putting on the Columbus Day celebration, which will take place around 11:15 a.m. at the monument, which depicts Columbus standing on a globe — to symbolize the New World — in the center of a small pool of water.