The Roots have announced the Third Annual Roots Picnic, with Vampire Weekend joining them at the top of the lineup. This year’s Picnic will take place on Saturday, June 5 at Philadelphia’s Festival Pier (Penn’s Landing).

?uestlove announced the event and initial lineup via Twitter with the following video where he also hints at a reunited Run DMC as another possible headliner:

Roots Picnic 2010 Lineup:

The Roots
Vampire Weekend
Mayer Hawthorne
The Very Best
DJ Jazzy Jeff
Tune Yards
Bajah + The Dry Eye Crew
MM Jamboys
Das Racist
Pattern Is Movement

Tickets go on sale Friday, March 5 at 10:00 a.m. EST.