CHICAGO (CBS) — It was the largest gathering of “life savers” ever assembled. Living organ donors from around the world met at Millennium Park. The goal: to set a living donor Guinness World Record.

They did it: A whopping 475 donors were at the event. It was almost double what they needed to break the previous record.

READ MORE: 'Autism Database' Seeks To Help Provide Help When Special Needs Kids Get Lost Or Go Missing

Chicago Police Superintendent Eddie Johnson, a recent organ recipient, addressed the crowd. He received a kidney from his son last August.

READ MORE: Cook County, Indiana Will Pause Use Of Johnson & Johnson Vaccine Amid CDC, FDA Review

“My son is my hero. He gave me a second chance at life,” said Johnson. “It’s my obligation now to put a spotlight on organ donations period and I know it’s not an easy thing to be a living donor but it’s the right thing.”

MORE NEWS: Man Lost Everything As He Waited On Callback From Illinois Department Of Employment Security That Never Came

Secretary of State Jesse White was also at the event. He started the Illinois Organ Tissue Donor Registry in 2006. That registry makes sure a person’s wish to be a donor is respected after they die.