While Lollapalooza raged in Grant Park this past weekend, five of the hottest acts booked for the festival had a party with Rolling Stone, performing at our invite-only day party at the Windy City's Studio Paris. DJ Hardwell, rapper A$AP Ferg, folk-pop duo Lewis Del Mar, electro-pop artist MØ and all-star EDM group Major Lazer – who made a surprise guest appearance during MØ's set – all converged on the venue to fire up the packed house with electrifying sets. The show was presented by Harley-Davidson and vitaminwater, and fans were even allowed to climb onto Harleys for a taste of what it's like to ride. Catch up on all the action in the photos that follow.
Hardwell and guests put their hands up … and they stayed there.
MØ was joined on stage by surprise guest Major Lazer to debut their new song "Get It Right," as well as performing their mega-hit collaboration "Lean On" and an acoustic version of "Cold Water."
MØ got up close and personal with guests at the day party.
The Danish singer, who put out her new single "Final Song" earlier this year, kept the party going until the end.
Harley-Davidson bikes were on display for guests to check out throughout the day.
Between sets, fans hopped on the bikes.
Fans were able to feel what it's like to ride a Harley with the Harley-Davidson Street 500 Jumpstart Activation, a simulator outside the venue.
A$AP Ferg's set got the crowd moving with the tracks "New Level" and "Shabba."
A$AP Ferg was on the up and up during his Lolla day party set.
Fans created custom vitaminwater labels at the brand’s Romance Copy kiosks.
Folk duo Lewis Del Mar kicked off the brunch party with hits like "Loud(y)."
As fog covered the crowd, Hardwell closed the party with a high-energy set.