Visitors to National Parks across the United States can enjoy free entry this Saturday, September 24, in celebration of Public Lands Day. Along with free admission, visitors will also get a chance to give a little back.

More than 2,000 volunteer events will take place across all 50 states and in Washington D.C. in what organizers are calling the largest 1-day volunteer event in the nation. Volunteers will work at parks across the country to remove debris, help with small construction efforts, and weed out invasive plant species.

The volunteer efforts will amount to an estimated $15 million in improvements, according to officials.

Can’t make it out this Saturday? Don’t worry; another chance at free sightseeing is just around the corner. Entry fees at all parks will be waived once again over Veteran’s Day Weekend (November 11-13).

Visitors should note that although entry fees will not be collected, charges for concessions, camping, and select tours will still be in effect.

Source: USA Today