The √ indicates admission is $5 or less, or free. Full-price admission is listed; * denotes discounts (or free) for students, seniors, military, members, children and/or advance purchases. Call venue for details. Comprehensive weekly event listings are online at www.honoluluadvertiser .com.

SPECIAL EVENTS

√ Hawai'i Book & Music Festival, with local, national, international authors and musicians, keiki rides, food, storytelling, atrium, entertainment, crafts, 10 a.m.-5 p.m., Honolulu Hale; free. www.hawaii bookandmusicfestival.org.

Kokua Festival, benefit for Kokua Hawaii Foundation, with Jack Johnson, Willie Nelson and the Planetary Bandits, Ben Harper and others, 4 p.m., Waikiki Shell; sold out.

Smuin Ballet, San Francisco-based company presented by Ballet Hawaii, 8 p.m., Blaisdell Concert Hall; $25-$45*. (877) 750-4400.

CONCERTS

McKinley Alumni 5th Annual Karaoke Challenge, dinner and show to benefit the scholarship and special projects fund, 4:30 p.m., McKinley High School cafeteria and auditorium; $20. 228-0954.

Guitar Virtuoso: Gene Bertoncini, featuring bassist Byron Yasui, 7:30 p.m., Doris Duke Theatre; $20*. 532-8700.

UH Jazz Ensembles, directed by Patrick Hennessey, 7:30 p.m, UH-Manoa Music Department Courtyard; $12*. 956-8742.

DANCE

"Electric Blue," by IONA Contemporary Dance Theatre, mythical tales of ocean lore, love and laughter, 8 p.m., Hawai'i Theatre; $25-$45. 528-0506.

STAGE

"Tales of Old Hawai'i," Honolulu Theatre for Youth interactive play about a girl who learns about her Native Hawaiian heritage, 9:30 and 11:30 a.m., Tenney Theatre; $16*. 839-9885.

"Go, Dog. Go!" Honolulu Theatre for Youth brings this children's picture book to life, 1:30 and 4:30 p.m., Tenney Theatre; $16*. 839-9885.

"You're a Good Man, Charlie Brown," musical based on the comic strip "Peanuts," 2 p.m., Paliku Theatre; $19*. 235-7433.

"An Act of Murder," interactive murder mystery dinner theater, premiering 7 p.m., Dave & Busters; $34.95. Reservations: 589-2215.

√ "Joseph and the Amazing Technicolor Dreamcoat," musical by the Kamehameha Schools Kapalama Campus Performing Arts Department, 7 p.m. Saturday, Princess Ruth Ke'elikolani Auditorium; $5*. 842-8496.

√ "Wonderland," musical adventure about a girl named Alice who ventures through the looking glass, presented by St. Joseph School Dramatize, 7 p.m., Leeward Community College; $5. 677-4475.

"The Mikado," Gilbert and Sullivan's classic comic operetta, final performance 7:30 p.m., Dillingham Hall, Punahou School; $10*. 944-5829.

√ "Equus," stylized play searches the mind of a young man accused of violence, 8 p.m., Kapi'olani Community College, Maile Performing Arts Theatre; recommended for mature audiences only; $5. 734-9225.

"Rhinoceros," classic absurdist comedy, premiering 8 p.m., Kennedy Theatre; $15*. 956-7655.

"4.48 Psychosis," Cruel Theatre production about mental illness, 8 p.m., The ARTS at Marks Garage; $15*. 550-8457.

"A Letter to My Mother at the End of the World," dark comedy about modern TV culture and the fracturing of relationships, premiering 11 p.m., Earle Ernst Lab Theatre; $8*. 956-7655.

FILMS

"Sophie Scholl: The Final Days" (2005, German with English subtitles), 1 p.m., Doris Duke Theatre at the Academy; $7*. www.honolulu academy.org, 532-8768.

√ "Yolngu Boy" (2001, Australian Aborigine language Gumatj, with English subtitles), 2, 4, 6 and 8 p.m., Movie Museum; $5*. 735-8771.

NATURE

√ Bird Walk, wear long pants and long-sleeved shirt, bring insect repellent, water and rain gear, 7:3010 a.m., Ho'omaluhia Botanical Garden; free. Reservations: 233-7323.

Earth Day Expedition, discover a few of the rare botanical specimens, 10 a.m.-2 p.m., Waimea Valley Audubon Center; free with $8* admission. 638-9199.

FAMILY TIES

√ Magician Kelvin Chun, 10 a.m., Waialua Bandstand; free. 637-8286.

√ Return of SpongeBob SquarePants, 11 a.m.-2 p.m., Pearlridge Center Uptown; free. 488-0981.