All events are free unless otherwise indicated.

COMING UP

"THE WISDOM OF SUSTAINABILITY," a dialogue on the globalized economy and how it affects us, by two-time Nobel Peace Prize nominee and leading Asia social thinker/activist, Sulak Sivaraksa, and Manulani Aluli Meyer, University of Hawai'i-Hilo associate professor of education; 6 p.m.; April 20; Maui Arts & Cultural Center, McCoy Studio Theater; $15; 808-242-7469.

THIRD ANNUAL SUSTAINABILITY FEST, University of Hawai'i Earth Day Celebration, with 11 a.m. to 6 p.m. open-air marketplace featuring more than 100 booths and vendors; 5 to 9 p.m. concert, with John Cruz, Natural Vibrations and Pressure Drop; and recycling collection (laptop computers, cell phones, athletic shoes, HI-5¢ containers, batteries, fishing lines, telephone books and magazines, cooking oil, (free) towing of unwanted cars — and donations for Goodwill Industries, Andrews Amphitheatre); UH-Manoa campus; 805-455-7400.

SUSTAINABLE LIVING EDUCATIONAL SERIES, "green" classes on rainwater harvesting, alternative power systems, sustainable gardening and "sustainability applied," 5 to 7 p.m.; April 23, 24, 30 and May 1, Natural Energy Lab of Hawai'i Authority Gateway Center, Kona, Hawai'i; $10 a class; 808-896-7656.

"PLANNING FOR KALAUPAPA'S FUTURE," public meetings with National Park Service, and its partners and public, on a four-year planning effort for long-term management of Kalaupapa; 6 to 8 p.m. April 23 and 9 to 11 a.m. April 24; Bishop Museum, Atherton Halau; 808-567-6802.

"PICTURING NATURE," a two-hour activity allowing participants to observe nature through a photographic slideshow set to music, or to express individual visions of nature in Makiki Valley's rainforest, through poetry, art or photography, 9 to 11 a.m.; April 25; Hawai'i Nature Center; $20/parent/child team; 955-0100.

HAWAIIAN ELECTRIC CO. "GROW HAWAIIAN FESTIVAL," an eco-conscious family festival in observance of Earth Day, featuring informational booths on local conservation and sustainability; guided museum garden tours, native plants sale, entertainment and keiki events; 9 a.m. to 3 p.m., Bishop Museum Great Lawn; free; 848-4135.

AMY GREENWELL GARDEN, COMMUNITY WORK DAY; 9 a.m. to noon April 25, Amy Greenwell Ethnobotanical Garden, Captain Cook, Big Island; free (materials provided); 808-323-3318.

POUHALA MARSH RESTORATION, removing invasive species and creating habitat for endangered Hawaiian stilts; 8:30 to 11:30 a.m. April 25; Hawai'i Nature Center, Waipahu; bring work gloves, drinking water, hat, sunscreen and covered-toe shoes; Pauline Kawamata, 955-0100, ext. 18, or volunteer@hawaiinaturecenter.org.

THIRD ANNUAL OCEAN DAY HAWAI'I, fun interactive displays, activities and booths to increase awareness of ocean issues and resources, conservation and safety; 10 a.m. to 3 p.m.; April 25, Hilo Pacific Aquaculture and Coastal Resources Center, Kalaniana'ole Avenue, Keaukaha, Hawai'i; free; 808-974-7642.

HO'OMALUHIA BOTANICAL GARDEN SPRING PRESCHOOL ACTIVITIES, 10:30 a.m. April 21 (spiders) and May 19 (bees); with story and song time, crafts and short hike. Recommended items: rain, mud and mosquito precautions, picnic lunch and covered shoes; free; 233-7323.

"ECO-FAITH: CREATING AND SUSTAINING GREEN CONGREGATIONS," a user-friendly guide for pastors, church leaders, congregations and individuals, by local psychologist Charlene Hosenfeld; available late April at local bookstores, or from The Pilgrim Press, 800-537-3394.

BE A GREENIE

FREE GARDEN MULCH, available 9 a.m. to 3 p.m. Saturdays, Halawa Xeriscape Garden; bring containers and shovel; 748-5041, www.boardofwatersupply.com.

WAIMEA VALLEY GREETER, volunteers needed one day a week for 2 1/2 hours; 638-7733.

WEED AND POT CLUB, Maui Nui Botanical Garden's Weed & Pot Club meets 8:30 to 10:30 a.m. Wednesdays, 150 Kanaloa Ave., Kahului, Maui, to do beautification and maintenance work; tools, gloves, drinking water provided; wear shoes; 249-2798.

NATIONAL GARDEN HELP, volunteers needed to protect rare plants and ecosystems at National Tropical Botanical Garden, Kaua'i; help needed in administration, conservation, education, development, etc.; 808-332-7324, ext. 228, or volunteer@ntbg.org.

Niaulani nature walk, guided tour through an old-growth forest; 9:30 a.m. Mondays; from Volcano Art Center, Niaulani campus, Volcano Village, Big Island; 808-967-8222, www.volcanoartcenter.org.

Niaulani Forest WorkDay, volunteers needed to preserve the rainforest; 9 a.m. to noon third Sunday of each month; Volcano Art Center, Niaulani campus, Volcano Village, Big Island; 808-967-8222.

TUESDAYS AT KANAHA, weekly beach cleanup and plant maintenance, coordinated by Community Pride at Kanaha Beach Park, Maui, 8 to 10 a.m. Tuesdays at the park; Valerie Vines Magee, 808-264-1454.

CHUN'S REEF BEACH /COASTCLEANUP by Adopt-A-Beach Hawaii and Save The Sea Turtles International; noon last Saturday monthly, from 61-529 Kamehameha Highway, Hale'iwa; trash bag, gloves and purified water provided; bring hat, sunscreen and beach shoes; 637-2211.

MAKIKI FOREST RESTORATION PROJECT, volunteers needed to weed, pick up branches and plant, water and fertilize native plants as part of Makiki Watershed Awareness Initiative forest restoration project; 9 a.m. to 2 p.m. fourth Saturday of each month; 973-9782.