Although Earth Day is officially observed on April 22, eco-themed events have been taking place throughout the month. Here are a number of ways to go green across the state:

Kokua Festival. Jack Johnson will share the stage with Dave Matthews at the Fifth Annual Kokua Festival running tomorrow and Sunday at the Waikiki Shell. Other performers include Paula Fuga, Go Jimmy Go and Mason Jennings. Proceeds will benefit Johnson's Kokua Hawai'i Foundation, a nonprofit organization that supports environmental education programs in schools and communities. Tickets are $40 for general admission/lawn, $50 for reserved seats, $125 in the seated pit area, and $20 general admission for children 3-12. Children under 3 are admitted free. Tickets available at Ticketmaster outlets, online at Ticketmaster or by phone at 877-750-4400. Visit www.kokuafestival.com.

Earth Day bags. Support Beach Environmental Awareness Campaign Hawai'i (BEACH) by purchasing new Earth Day bags for $3 each. Proceeds will to used to support environmental education, litter prevention campaigns and beach cleanups. Bags are available at www.b-e-a-c-h.org and from Kale's Natural Foods in the Hawai'i Kai Shopping Center and at various Earth Day events.

Pearl Harbor Bike Path Cleanup. Volunteers are welcome from 8:30-11:30 a.m. tomorrow to assist with an Earth Month cleanup of the Pearl Harbor bike path and Kapakahi Stream. Sponsors are the city Department of Environmental Services, Navy Region Hawai'i and the 'Aiea and Pearl City Lions Club.

Mokauea Island work day. Kai Makana is helping the Mokauea Fishing Village Association create an educational center to spread awareness of traditional subsistence methods. Mokauea Island near Sand Island is considered one of the last fishing villages in the state. The next work day is tomorrow. Transportation to island is by outrigger canoe; bring old shoes, hat, sunscreen, water, shorts and T-shirt. E-mail kaimakana@gmail.com to confirm date and receive waiver and directions to the project.

John Muir Day. Join the Sierra Club for a 6-mile, moderately difficult hike and service project to Manana Falls tomorrow. Bring pruning saws, loppers, or clippers for trail work. Before going to the pools and waterfalls, participants will walk a half-mile farther to look at a burned area and trees that were planted in 1995 and '96 at a slide area. After a swim and lunch, hikers will return via the same trail. Call Ed Mersino at 223-5765 or Arlene Buchholz at 988-9806.

Sandy Beach Cleanup. CITO (Cache In Trash Out) will host a cleanup at Kaloko Pond and Sandy Beach from 10 a.m.-12:30 p.m. tomorrow. Register at 9 a.m. at Sandy Beach's north bathroom. Bring gloves and old clothes; picnic to follow. Contact mike@islandrecreation.net.

Sandy Beach Cleanup II. The Hawaii State Bodysurfing Association will hold its 5th Annual Earthday Sandy Beach Cleanup at 9 a.m. Sunday, with potluck lunch to follow. Call 864-1329.

Sand Island Access Road cleanup. American Carpet One is sponsoring a cleanup tomorrow from Sand Island park to the bridge from 6:30-7 a.m. and from the bridge to Nimitz Highway from 4-5 p.m. Call 832-2000 to learn more.

Kokua Kalihi Valley. Volunteers are needed from 8:30 a.m.-noon tomorrow to help develop a land-based health program for Kokua Kalihi Valley. Work includes weeding, gardening, removing invasive species and replanting native forests. Meet at 3659 Kalihi St.

Earth Day Weed-a-Thon. The O'ahu Army Natural Resources Program is hosting its annual Earth Day Weed-a-Thon on Tuesday. Bring your grubby clothes, lunch and a desire to make a positive impact on one of O'ahu's few remaining mesic forests. This effort will concentrate on Kahanahaiki in the Wai'anae Range, home to many of O'ahu's endangered plants and the endangered kahuli tree snail. Call 656-7641.

Grow Hawaiian Festival. Hawaiian Electric Co. presents Grow Hawaiian Festival 2008 from 9 a.m.-5 p.m. April 26 at Bishop Museum. The free event focuses on native and Polynesian-introduced plants of Hawai'i with a series of talks, plus plant sale and tour of the museum's native and indigenous plants, and lomilomi, lei making, ipu, weapons, wood carving and weaving demonstrations, entertainment and food. Reusable grocery bags will be given to first 100 attendees.

MAUI

Celebration and Plant Sale. Maui Nui Botanical Gardens will hold its 2008 Earth Day Celebration & Plant Sale from 10 a.m.-3 p.m. tomorrow at 150 Kanaloa Ave. in Kahului. The free event features entertainers George Kahumoku Jr., Uncle Richard Ho'opi'i and others; Hawaiian food, games and crafts such as lei making, kapa beating and cordage making; and educational booths focusing on conservation, native species, recycling and Hawaiian culture. Call 808-249-2798.

Earth Day Festival. Enjoy live entertainment, environmental and social awareness booths and speakers, food booths, and keiki activities at this free event from 10 a.m. to sunset Sunday at Baldwin Beach Park in Pa'ia. Sponsors include the Sierra Club, Maui Tomorrow, GMO Free Maui, Earth Foundation and Hawaii Health Guide. Call 572-6929 or e-mail EarthDay@maui.net.

Free ocean cruises. The Pacific Whale Foundation will be giving away more than 1,000 tickets to Hawai'i residents and its members for Ocean Discovery Cruises on Sunday. The free one-hour cruises will take place throughout the day, starting at 10:30 a.m. Environmental displays, keiki activities and entertainment will be featured at the foundation's Ocean Discovery Center at The Harbor Shops at Ma'alaea. For reservations for the free cruises, call 808-249-8811. Proof of residency will be required at check-in.

MOLOKA'I

Earth Day Celebration. The Nature Conservancy is sponsoring the Moloka'i Earth Day Celebration from 5-9 p.m. today at the Mitchell Pauole Center in Kaunakakai, with food, entertainment, prizes and educational displays. Call Kathy Tachibana at 808-553-5236.

KAUA'I

Earth Day at Lydgate Park. Join The Friends of Kamalani from 7 a.m.-1 p.m. tomorrow for a maintenance workday. The Kamalani Playground was built in 1994 by volunteers. Contact Thomas Noyes at 808-639-1018 or e-mail ThomasNoyes@hawaiiantel.net. For more information, visit www.kamalani.org.

BIG ISLAND

HawCC's 20th Earth Fair. Enjoy native plant giveaways, keiki entertainment and activities, food, educational videos, garden tours, ant farm exhibits and more than 70 exhibitors at Hawai'i Community College's Earth Fair from 9 a.m.-4 p.m. today at the community college plaza on the upper campus. Mayor Harry Kim and others will speak at 10:30 a.m. in the theater followed by a 15-minute version of Al Gore's "An Inconvenient Truth" at 11:30 a.m. presented by the Pacific and Asian Affairs Council's Josh Cooper. Students will perform environmental hip-hop to keep things lively. Other entertainment includes hula, belly dancing, gymnastics, Marshallese and Brazilian dance, West African drummers, and the Ola'a Community Center Trash Fashion Show. Visit the fair Web page at www.hawaii.hawaii.edu/eday or call Ola Jenkins at 808-933-1105.

Kona Earth Festival. Officially known as E Pulama I Ka Honua (Cherish the Earth), the Kona Earth Festival is a West Hawai'i community collaboration presented by the Institute for a Sustainable Future to educate and involve people in sustaining natural, economic and cultural resources. The festival begins tomorrow with the eighth annual Coral Reef Awareness Day & Earth Day Fair from 10 a.m.-2 p.m. at the Keauhou Resort and Kahalu'u Beach Park, and continues over five weeks.