Summerfest is an annual music festival held in downtown Milwaukee, Wisconsin. First held in 1968, Summerfest is located at Henry Maier Festival Park, adjacent to Lake Michigan and Milwaukee's central business district. Summerfest attracts approximately 800,000 people each year, promoting itself as "The World's Largest Music Festival", a title certified by the Guinness World Records in 1999, but has been surpassed in attendance by Donauinselfest with over 3 million in 2015. - Source: Wikipedia