High Quality Content by WIKIPEDIA articles! Summerfest (also known as "The Big Gig") is a yearly music festival held at the 75-acre (300,000 m2) Henry Maier Festival Park along the lakefront in Milwaukee, Wisconsin, USA. The festival lasts for 11 days, is made up of 11 stages with performances from over 700 bands, and since the mid-1970s has run from late June through early July, usually including the 4th of July holiday. Summerfest attracts between 800,000 and 1,000,000 people each year, promoting itself as "The World`s Largest Music Festival," a title certified by the Guinness World Records in 1999.