The Radio 92.9 EarthFest returns to the Hatch Memorial Shell, in Boston, from 10 a.m. to 5 p.m., May 18, with a lineup of national acts, local bands and music. Presented by Whole Foods Market, this family-friendly festival is the largest free radio station concert in the country, showcasing environmentally friendly businesses and products and local nonprofit environmental organizations and agencies.

The Whole Foods Market Vendor Village will be a festival highlight, with more than two dozen vendors showcasing Earth-friendly products and providing samples for people to try at home. More music and activities will be found in Kids’ Planet, an interactive area designed with families in mind.

The 20-year-old festival also features exhibits and environmental displays focused on raising awareness and spreading information about environmental issues facing the planet. This year’s highlights will include a hybrid bus display from the MBTA, a free bike valet offered by MassBike and the Eco-Pavilion, where dozens of local environmental groups and agencies will be onsite to share information. Casella Waste Systems will implement an extensive recycling program throughout the festival to help minimize the event’s environmental impact.

Cost: Free. Location: The DCR Hatch Memorial Shell, 47 David G. Mugar Way on the Esplanade in Boston. For more information, visit EarthFest.com.