Usher is joining the event as a co-headliner, along with Ms. Lauryn Hill and Lil Uzi Vert.
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Diddy, who was originally scheduled to perform at the event, will no longer appear "due to unforeseen circumstances," organizers say.
The Roots Picnic will be held at the Mann in Fairmount Park on Saturday, June 3 and Sunday, June 4.
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In addition, there will be a special stand-up comedy performance from Dave Chappelle and The Roots at the Wells Fargo Center on Friday, June 2 to kick off the weekend. The show is sold out.
Tickets for the two-day festival are available at therootspicnic.com/tickets.