Children’s Museum Tucson, 200 S. Sixth Ave.

Photos by Ron Medvescek / Arizona Daily Star

Earth Day events in Tucson will be held at Children’s Museum Tucson, Biosphere 2 and Summit Hut on Saturday, April 22.

The 23th annual Tucson Earth Day Festival returns to Armory Park from 10 a.m. to 2 p.m. on Saturday, April 22. And as always, admission to this family-friendly event is free.

Last year, the festival teamed up with Cyclovia. This year, its joined forces with the Children’s Museum Tucson.

“It’s been many years since we’ve had the Tucson Earth Day Festival at the Children’s Museum (200 S. Sixth Ave.) and Armory Park and we’re excited to be able to offer free admission to the museum all day,” Georgia Armstrong, committee chair of the event, said in a press release.

The festival usually draws from 3,000 to 5,000 people and 50 to 60 exhibitors, but organizers think the free museum admission may draw more families.

To be admitted into the museum, adults must be accompanied by a child and children must be supervised by an adult.

April is Bike Fest month and coordinators are encouraging people to ride to the event and park their bikes at the free valet area. Kids can challenge themselves on a bike obstacle course and get a free helmet from the Pima County Bicycle and Pedestrian program while supplies last.

Families also can engage in fun hands-on activities while getting smarter about alternate modes of transportation, renewable energy, land and water conservation, native plants, invasive species, air quality, climate resiliency, sustainability, alternative fueled vehicles and more.

BIOSPHERE 2

The University of Arizona will celebrate Earth Day and the 10th anniversary of UA research at Biosphere 2 on Saturday with a day of activities that include hermit crab releases every half hour at the Biosphere ocean, and a sunset concert by Calexico.

Biosphere 2, 32540 S. Biosphere Road in Oracle, about 30 minutes outside Tucson, is adding to its regular tour events special lectures and panel discussions on the future of the Earth, energy, water and food; beach and rainforest tours; and groundbreaking for a vertical farm complex.

The research center also will include a focus on Tucson as the first UNESCO City of Gastronomy. Tucson-based chefs, growers, producers, distillers, ranchers, innovators and advocates will be set up in the main tent on the Biosphere 2 lawn.

VIP tickets for the all-day special event and the Calexico concert at sunset are $32 each and include a Biosphere 2 annual pass.

SUMMIT HUT

Summit Hut is challenging Tucsonans to help save the rainforest by donating old cellphones on Saturday, when the local retailer hosts Topher White, engineer and physicist of the Rainforest Connection.

He will turn the donated cellphones into autonomous, solar-powered listening devices that can monitor and pinpoint chainsaw activity from great distances throughout the rainforest.

White is dedicated to stopping the 58,000 square miles of deforestation that happens in rainforests each year. He will give a brief presentation from 5:30-6:30 p.m. Saturday at the Summit Hut, 5251 E. Speedway, and then demonstrate how to assemble the deforestation tracking devices with the donated phones. Summit Hut is also offering a discount on gear when you donate a cellphone at the store.