A rally in Daley Plaza to celebrate the 20th annual Chicago Cares Serve-a-Thon. (Credit" Mike Krauser)

A rally in Daley Plaza to celebrate the 20th annual Chicago Cares Serve-a-Thon. (Credit” Mike Krauser)

CHICAGO (CBS) — The spirit of volunteerism is alive and well in Chicago today as people spruce up schools, parks and playgrounds for the 20th annual Chicago Cares Serve-a-Thon, reports WBBM’s Mike Krauser.

5,000 volunteers gathered on the Daley Plaza before heading off into the neighborhood for a day of service.

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Chelsea Clinton brought a group of volunteers from the Clinton Foundation.

“I want to thank you for all of the fantastic t-shirts. I particularly like the ‘geeks give.’ It is just so invigorating to see so many cheerful givers,” said Clinton.

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“I look out at 5,000 volunteers who are giving their day to the city that we love and I am humbled,” said Bridgett Altenburg, Chicago Cares Executive Director.

“The one thing that I see about volunteerism is that the more people here about the opportunities to serve like Serve-a-Thon, the more they serve,” said Altenberg.

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Chelsea Clinton addresses the crowd at the rally. (Credit: Mike Krauser)

Chelsea Clinton addresses the crowd at the rally. (Credit: Mike Krauser)

Nearly 300 teams representing more than 100 companies are taking part.