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.

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

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“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.”

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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.