Civic-minded young Washingtonians have a chance to be a part of something bigger than just D.C., while at the same time helping their neighbors. Thousands of young people will give back this weekend as part of Global Youth Service Day (each individual project is one day, but the event runs from April 25-27).

Global Youth Service Day started internationally 20 years ago. Independent organizations all over the world coordinate efforts in their respective cities to encourage youth to give back. The mayor’s office in the District has coordinated the event here in D.C. for the last six years. It’s the largest service day in the world, and last year more than 35,000 people volunteered at more than 200 project locations.

Projects around the world range from beautification, such as murals, to raising malaria awareness, to cleaning up the Anacostia river. (we can all get behind that). Non-profits, faith-based groups, District and federal government agencies, public schools, libraries and parks are all working together.

“Volunteers are the lifeblood of our city. From schools and shelters to hospitals and hotlines, volunteers are vital to the District of Columbia ’s social and economic well-being,” said Mayor Adrian Fenty in a statement. “During Global Youth Service Day and throughout the year, we appreciate volunteers across every ward who are making a more compassionate and decent society.”

It’s not too late to get involved: if you’re between 5 and 25 years of age, go find the cause of your choice, like trash clean-up or shelter food preparation. Most of the projects still have slots open, so check out the list and contact the coordinator at the site where you’d like to help.