EarthX, a locally based international environmental nonprofit, will host its 12th annual Earth Day Expo at Fair Park in Dallas this month.

Earth Day Expo, which the organization says is “the world’s largest green gathering,” is a three-day conference that brings environmental organizations, government agencies, experts and more together to discuss sustainable solutions to environmental issues. The event will take place April 21-23.

Each year, the event draws an average of 177,000 attendees, 700 exhibitors, 400 speakers and 2,000 conferees, according to the EarthX website. Entry to the expo is free, but guests are encouraged to register online to plan which events and experiences to attend.

The forum is designed in a festival format featuring a range of exhibits, learning and interactive experiences, and speaker forums. This year’s schedule includes topics such as federal environmental policies, climate adaptation, nature conservation, sustainable energy, environmental justice and hemp sustainability.

Several Dallas officials are scheduled to speak during various portions of the event, including at two forums about environmental justice issues affecting I-345—the section of elevated interstate that connects I-45 and US 75 near downtown.

In addition to the Earth Day Expo, EarthX will also convene its Congress of Conferences, which brings together top leaders to address issues of sustainability, climate and global innovation. The paid event will be held April 19-23 also at Fair Park.