WAIKIKI AQUARIUM DOCENTS — Free training for "Edge of the Reef" volunteer docents will be Sept. 4-20 (6:30-9 p.m. Tuesdays and Thursdays, 9 a.m.-noon Saturdays). Call 440-9020 or visit http://waquarium.org.

CRATER TRIP — The Friends of Haleakala National Park will conduct a service trip Friday to next Monday to paint Holua Cabin and weed heterothica. Call 808-248-7660.

HALEAKALA LEARNING TRIP — Join the Friends of Haleakala National Park for a service learning trip Sept. 1-3, with a two-night stay at Holua Cabin. Volunteers will work four hours a day and learn about the park's ecosystems from park staff; $15 fee. Call 808-876-1673.

SIERRA CLUB BEER NIGHT — Hear presentations on environmental topics and how to get involved, at Cassis, 66 Queen St.: 5:30-7:30 p.m. Aug. 22, global warming update with Jeff Mikulina; 5:30-7:30 p.m. Sept. 26, curbside recycling with Betty Gearan.