Black Eyed Peas at Peppermint Club - photo credit: Daniel Seyum

Black Eyed Peas at Peppermint Club in Los Angeles, CA

Hip-hop group Black Eyed Peas and other acts performed at the Peppermint club in Los Angeles, CA. City of Hope, a leader in cancer research and treatment, presented the first annual "Butterfly Ball" event.

The fundraising event celebrated the legacy of music industry executive Yassy Hosseini on what would have been her 40th birthday, building on her efforts to fight back against cancer.

Photos by Daniel Seyum