Summer Jam at Watkins Glen: Nearly 600,000 people attend a rock festival at the Watkins Glen International Raceway.

The Summer Jam at Watkins Glen was a July 1973 rock festival outside Watkins Glen, New York, that featured the Allman Brothers Band, the Grateful Dead and The Band. The July 28, 1973, event long held the Guinness Book of World Records entry for "largest audience at a pop festival," with an estimated 600,000 fans in attendance at the Watkins Glen Grand Prix Raceway. Approximately 150,000 tickets were purchased in advance, the rest being admitted in what became a "free concert".

A rock festival is an open-air rock concert featuring many different performers, typically spread over two or three days and having a campsite and other amenities and forms of entertainment provided at the venue. Some festivals are singular events, while others recur annually in the same location. Occasionally, a festival will focus on a particular genre, but many attempt to bring together a diverse lineup to showcase a broad array of popular music trends.

Watkins Glen International, nicknamed "The Glen", is an automobile race track in the northeastern United States, located in Dix, New York, just southwest of the village of Watkins Glen for which it is named, at the southern tip of Seneca Lake. It is long known around the world as the former home of the Formula One United States Grand Prix, which it hosted for twenty consecutive years (1961–1980). In addition, the site has also been home to road racing of nearly every class, including the World Sportscar Championship, Trans-Am, Can-Am, NASCAR, the International Motor Sports Association, and the IndyCar Series. The facility is currently owned by NASCAR.