City of Hope Orange County, part of one of the largest and most advanced cancer research and treatment organizations in the United States, announced today that Diana Ross will perform at its 2025 Promises of Hope gala. The annual gala is a celebration of the philanthropic support that powers innovation in cancer research and treatment. The Oct. 11 gala will be held on City of Hope Orange County’s academic cancer campus in Irvine, set against the backdrop of Orange County’s only specialty cancer hospital. This year, as we open Orange County’s only cancer specialty hospital, we are delivering on that promise,” Walker said. This new specialty cancer hospital is no exception,” said Kristin Bertell, chief philanthropy officer, City of Hope.