TODAY

BLOOD DRIVES, 8 a.m.-3 p.m., Nanakuli High & Intermediate School; 7-11 a.m., Kaiser Ko'olau Clinic; 1-3:15 p.m., Honda Windward; must be 18 or older, in good health, weigh at least 110 pounds and present photo ID. 845-9966.

BACKYARD COMPOSTING, organic gardener, Evelyn Giddings, to lead a workshop on how to build and harvest a compost pile, 10 a.m.-noon, The Green House, 224 Pakohana St., Pauoa; $15. Registration: www.thegreenhousehawaii.com, 524-8427.

TOMORROW

BLOOD DRIVES, 7 a.m.-2 p.m., Windward Mall; 9 a.m.-2:30 p.m., Central Seventh-day Adventist; must be 18 or older, in good health, weigh at least 110 pounds and present photo ID. 845-9966.

AARP CARFIT, free class conducted by a trained professional on comfort and safety-enhancing adjustments older drivers can make to their cars, 8 a.m.-noon, Kaimuki High School; free. Registration: 843-1906.

WORM WORKSHOP, sponsored by the Board of Water Supply, 10 a.m.-noon, Halawa Xeriscape Garden, Halawa Valley Central Industrial Park; meet the worms, make your own mini-bin and learn about vermicomposting; free garden tour 9:30 a.m.; bring lunch; $30, members $20, guests $10, includes mini-bin, starter worms and manual. Register: waikikiworm@hawaii.rr.com, 382-0432 (Mindy).

Mother's Day luncheon benefiting Hawaii Gifted Association, 11:30 a.m.-1 p.m., Elua Restaurant, 1341 Kapi'olani Blvd.; lunch includes spring fashion accessories, flowers, photos and Padovani's chocolates; $50. Reservations: 597-8824.

UPCOMING

BLOOD DRIVES, 7:30 a.m.-1:30 p.m. Sunday, Foodland Kailua; 8 a.m.-3 p.m. May 11, Wai'anae High School; must be 18 or older, in good health, weigh at least 110 pounds and present photo ID. 845-9966.

HANGAR TALKS: "A Gathering of Mustangs & Legends," monthly aviation presentation, 1 p.m. May 16, Pacific Aviation Museum, hangar 37, Ford Island, Pearl Harbor; museum admission: adults $14, children $7, kama'aina and military adults $10 and children $5. www.PacificAviationMuseum.org.

FREE HAWAIIAN CULTURE CLASSES taught by cultural practitioners, 10 a.m.-4 p.m. Sundays beginning June 3 at Waimea Valley's Ka Papa 'Oihana; stone masonry, house construction, weapon, fishing implement, stone bowl and poi pounder making will be taught; students may take items home; register by May 20; space is limited. www.huinaauao.com.