PHOTOS: T-Pain, Lonely Island among celebs with mic-dropping sets at San Francisco's Clusterfest

The Lonely Island is seen performing with T-Pain at Clusterfest in San Francisco, Calif. on June 1, 2018. (KGO-TV)

T-Pain is seen performing at Clusterfest in San Francisco, Calif. on June 1, 2018. (KGO-TV)

The Wu-Tang Clan is seen performing at Clusterfest in San Francisco on Sunday, June 5, 2018. (KGO-TV)

The Lonely Island is seen performing with Michael Bolton at Clusterfest in San Francisco, Calif. on June 1, 2018. (KGO-TV)

A crowd watches music performances at Clusterfest in San Francisco, Calif. on June 1, 2018. (KGO-TV)

The Lonely Island is seen performing at Clusterfest in San Francisco, Calif. on June 1, 2018. (KGO-TV)

Michael Bolton performs at Clusterfest in San Francisco, Calif. on June 1, 2018. (KGO-TV)

The Lonely Island is seen performing with T-Pain at Clusterfest in San Francisco, Calif. on June 1, 2018. (KGO-TV)

A crowd of people smile as they watch music performances at Clusterfest in San Francisco, Calif. on June 2, 2018. (KGO-TV)

Jon Stewart is seen at Clusterfest in San Francisco on Sunday, June 5, 2018. (KGO-TV)

A crowd of people smile as they watch music performances at Clusterfest in San Francisco, Calif. on June 1, 2018. (KGO-TV)

Jon Stewart is seen at Clusterfest in San Francisco on Sunday, June 5, 2018. (KGO-TV)

Comedian Jim Jeffries is seen at Clusterfest in San Francisco on Sunday, June 5, 2018. (KGO-TV)

Comedian Jeff Ross is seen at Clusterfest in San Francisco. (KGO-TV)

A man smiles during a music performance at Clusterfest in San Francisco, Calif. on June 1, 2018. (KGO-TV)

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.

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