Summerfest (also known as "The Big Gig") is a yearly music festival hel at the 75-acre Henry Maier Festival Park along the lakefront in Milwaukee, Wisconsin. The festival lasts for 11 days, and since the mid-1970s has run from late June through early July, always including the 4th of July holiday during that period. Summerfest attracts almost one million people each year. Summerfest promotes itself as "The World's Largest Music Festival," a title certified by the Guinness World Records in 1999. Summerfest is run by the non-profit Milwaukee World Festival Inc.