Historic preservation lecture: Nellie Longsworth of Preservation Action, Washington, D.C., speaks on "Lobbying Congress in '96," noon, Iolani Barracks Visitor Center, palace grounds. Free. Call 956-9546.
"A Night of Sharing": Mililani Uka Elementary School and its parent-teacher organization present a Curriculum and Family Night featuring student projects and talents, 5:30 to 8 p.m. Call Vikki at 627-7023.
Natural history lecture: Researcher Richard Grigg describes ancient reef builders and explains how reef development can reveal earth history and contribute to the formation of islands, 7:30 p.m., Waikiki Aquarium foyer. Doors open 7 p.m. Donation $4. Call 923-9741. Coral reef lecture series concludes May 15.
Hawaii Pacific University: Free financial aid seminar, 12:15 p.m. Call 544-0238.
"The Mummies of Xinjiang": Elizabeth Barber, professor of linguistics and archaeology at Occidental College, Los Angeles, discusses a recent find of mummified Caucasian bodies, 5 p.m., Academy Theater. The remains date back to the Bronze Age, nearly 2,000 years before the Silk Road was established. Free. Call 955-4416.
Space lecture: "Comets! What's All the Fuss," by astronomy professor Karen Meech, 7:30 p.m., NASA Planetary Data Center, UH-Manoa's Sinclair Library. Free. Call 956-3132.
Hawaii Pacific University: Free seminar on cooperative education and internships, 12:15 p.m. Call 544-0238.
Mayfest: Food, crafts and a traditional May Day court, 5:30 to 9 p.m., Campbell High School, Ewa Beach.
"Ghosts of Hawaii": Supernatural tales with Glen Grant of Honolulu TimeWalks, 7:30 to 10 p.m., Waikiki Heritage Theater. Costs $8. Reserve at 943-0371.
Orchid show and plant sale: 8:30 a.m. to 6 p.m. Saturday and 8:30 a.m. to 4 p.m. Sunday, Noelani School cafetorium. Lecture on orchid culture 10 a.m. Saturday; workshops on potting orchids 2 p.m. Saturday and corsage making 10 a.m. Sunday. Free admission. Call 537-3071.
Urban Garden Center: Open house featuring the radish trials, 9 a.m. to noon, 962 Second St., Pearl City. Free. Call 453-6050.
Lyon Arboretum: Jerry Shelmidine shows how to grow culinary herbs in backyards and containers, 9:30 to 11:45 a.m.; costs $15.50 plus $2 supply fee. Learn about tropical plants for landscaping at Sharon's Plants, a nursery in Waimanalo, 9:30 to 11:45 a.m.; costs $15.50. Call 988-7378.
St. Joseph School: Fiftieth-anniversary celebration features Willie K and others, 10 a.m. to 2:30 p.m. at the Waipahu school. Eucharistic celebration 9 a.m. Tickets $12. Call 677-4475 or 677-4276.
Doll show: Collectibles, local porcelain creations, magazines and more, daily through May 11, Koko Marina Shopping Center.
"Hungry Ghosts": Chinese stories with Barbara Wong, 7:30 to 9 p.m., Waikiki Heritage Theater. Costs $8. Reserve with Honolulu TimeWalks at 943-0371.
Keiki Kani Choir performs: "Talk to the Animals" and other medleys, 1:15 p.m., Pearlridge Uptown.
Kapahulu Senior Center: May Day program features the royal court, Fern Elementary ukulele and hula students, a Japanese minyo singer, lei contest and crafts, 10 a.m. Call 737-1748.