Seven World Central Kitchen aid workers - including Australian Zomi Frankcom - killed by Israeli air strikes in Gaza will be honoured at a memorial at the National Cathedral in Washington.
Jose Andres, the celebrity chef and philanthropist behind the Washington-based World Central Kitchen disaster relief group, is expected to speak at the celebration of life service on Thursday.
Famed cellist Yo-Yo Ma will also perform, organisers said.
The Biden administration said Douglas Emhoff, husband of vice president Kamala Harris, and US assistant deputy secretary of state Kurt Campbell would attend.
The aid workers were killed on April 1 when a succession of Israeli armed drones ripped through vehicles in their convoy as they left one of World Central Kitchen's warehouses on a food delivery mission.
Palestinian Saifeddin Issam Ayad Abutaha, Britons John Chapman, James Kirby and James Henderson, dual US-Canadian citizen Jacob Flickinger, and Polish citizen Damiam Sobol were also killed in the attack.
Following an investigation, Israel said the military officials involved in the strike had violated policy by acting based on a single grainy photo that one officer had contended - incorrectly - showed one of the seven workers was armed.
The Israeli military dismissed two officers and reprimanded three others.
The aid workers, whose trip had been co-ordinated with Israeli officials, are among more than 220 humanitarian workers killed in the six-month-old Israel-Hamas war, according to the United Nations.
That includes at least 30 killed in the line of duty.
The international prominence and popularity of Andres and his non-profit work galvanised widespread outrage over the killings of the World Central Kitchen workers.
Their deaths intensified demands from the Biden administration and others that Israel's military change how it operates in Gaza to spare aid workers and Palestinian civilians at large, who are facing a humanitarian crisis and desperately need aid from relief organisations as the UN warns of looming famine.
World Central Kitchen and several other humanitarian aid agencies, suspended work in Gaza after the attack.
"We haven't given up," World Central Kitchen spokeswoman Linda Roth said.
"We are in funeral mode right now."
Religious leaders of multiple faiths will participate in Thursday's services.
Funerals were held earlier in the workers' home countries.
Australian Associated Press
