Old St. Patrick's Church, Chicago's oldest public building and a treasured historic landmark, is the host of the 28th annual World's Largest Block Party. This event is a party with a purpose. Proceeds support the mission and outreach activities of Old St. Pat's, including the Education Center, the Outreach Group, Horizons For Youth, Career Transitions Center of Chicago, and Global Alliance for Africa. Approximately 20,000 people will enjoy great music, fantastic food and fabulous fun. Headliners include Ben Folds Five (June 29) and Lifehouse (June 30), plus eight additional bands over the course of two nights.