SAN FRANCISCO (KGO) -- Thousands of people packed San Francisco's Civic Center area this weekend to see their favorite comedians and musicians at Clusterfest.
The Lonely Island, T-Pain, and Michael Bolton were among the musicians who delivered epic high-energy sets.
Click here for more information about the festival.
PHOTOS: T-Pain, Lonely Island among celebs with mic-dropping sets at San Francisco's Clusterfest
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The Lonely Island is seen performing with T-Pain at Clusterfest in San Francisco, Calif. on June 1, 2018.
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