You may think you know Atlanta, but you have no idea. Get out and discover the city at the ninth annual ATLANTA DOWNTOWN FESTIVAL! The ADF scavenger hunt puts you to the test with an opportunity for aimless gallivanting, fierce competition and cash prizes while exploring public art works and historical highlights. After you've won your dough, chill out on a few rooftops at the Top of Atlanta with Mediterranean-influenced music, artists and chefs. The rooftop tour exposes patrons to cool information about the surrounding downtown area and a fantastic view. Free-$35. Noon. 250 Park Ave. 404-272-1967. www.atlantadna.org.