The Irish Descendants of Chattanooga group marches in the St. Chatty's Day Parade in celebration of St. Patrick's Day on Saturday, March 17, 2018, in Chattanooga, Tenn. Instead of its usual route across the Market Street Bridge, this year's parade traveled along Main Street to Market Street past the Chattanooga Choo Choo. Photo Gallery Photos: St. Chatty's Day Parade Photos of the annual St. Chatty's Day Parade celebrating St. Patrick's Day.