The Marcus Amphitheater is an amphitheater on the south end of the Henry Maier Festival Park (also known locally as the Summerfest grounds) in Milwaukee, Wisconsin. The amphitheater was built after an extremely overcrowded Huey Lewis and the News concert in 1984, which drew 30,000 fans to a space suited for 15,000[1], to carry crowds of 25,000 fans during concerts.