The Chicago Lollapalooza attended by 2026 fans is described as lasting four days.
The 2026 edition is scheduled from Thursday, July 30, through Sunday, August 2, making the festival a four-day event. Official festival information describes daily performances, food and drink vendors, and activities spread across the Grant Park grounds.
Lollapalooza’s format has changed over time. The original 1991 event was a touring festival that visited multiple cities, and later touring editions used different schedules. The modern Chicago flagship is commonly recognized for its large, multi-day summer program rather than a single concert date.
A related source of confusion is that Lollapalooza editions in other countries may use different lengths. The answer “four” applies to the Chicago 2026 edition named in the question.