October 4

American Red Cross Hawaii Chapter, 4155 Diamond Head Road, 8:30-11:30 a.m., $70. Learn emergency action steps and first aid procedures for injuries and sudden illnesses. (1-800-733-2767, redcross.org/take-a-class)

Castle Medical Center, four Sundays from Oct. 4, 6-8 p.m., $45/person, $80/couple. Designed and taught by experienced labor and delivery nurses, this class is specifically geared for couples giving birth at Castle Medical Center. You will learn different aspects of the birth experience, from preparing for the hospital to caring for you and your baby. Pre-registration required. (263-5400, castlemed.org)

UH-Manoa’s East-West Center, Keoni Auditorium, 1777 East-West Road, 9 a.m.-5 p.m., $125. Learn how to help special needs children afflicted with chronic pain and other limitations regain full functioning. Pre-registration required. (721-1773, mika@sandbox-hawaii.com)

Hanauma Bay Nature Preserve, Education Alcove Classroom, 3-4 p.m., free. Chad Yoshinaga of NOAA presents, “Risk and Reward: Field camp tales of the hazards and triumphs encountered in NWHI monk seal research.” (397-5840)

Pearlridge Center Downtown, 1-4 p.m., free. A dozen artists gather to create cooperative art, and keiki and families are invited to watch or participate! (203-2366)

Kilauea District Park, 4109 Kilauea Ave., Oct. 4 and 18, 11 a.m.-3 p.m., $80/registration. Diamond Head AYSO will be conducting its 2016 Spring Walk-in Registration for children interested in playing soccer. Registration fee includes jersey, shorts and socks, age group award and picture taking. (r48@registrar@aysohawaii.org)

Honolulu Polo Club in Waimanalo, Sundays through Oct. 25, 3 p.m., $5. Enjoy the 29th season of polo with Honolulu Polo Club. (honolulupolo.com, 521-6927)

Blaisdell Hawaii Suites, 777 Ward Ave., 10:30 a.m.-4:30 p.m., $4.50/general. The 14th annual Halloween edition of the collectibles show brings over 70 vendors to 93 tables full of antiques, Hawaiiana, art, jewelry and more. (ukulele.com/wikiwiki.html)

Meet at Church of the Crossroads back porch, 2510 Bingham St., 8 a.m., free. Hike three miles along one of the shortest routes to the Koolau summit. Reservations required. (makikirandy@yahoo.com, sierracluboahu.org)

Nico’s Pier 38, 1129 N. Nimitz Hwy., 6-8 p.m., free. 20 Degrees North plays an eclectic mix of contemporary, easy-listening and Hawaiian music every first and third Sunday. (540-1377)

Kahala Mall, 2-3 p.m., free. (facebook.com/kaimimusic808)

UH-Manoa’s Art Building, Art Gallery, Oct. 4-Dec. 4, weekdays from 10 a.m.-4 p.m., Sundays from noon-4 p.m., free. This exhibit examines the phenomenon and reasons for the resurgence of abstraction. Works by 29 New York artists are featured. Reception on Oct. 4 from 3-5 p.m., after an hour-long gallery walkthrough with its curators. (956-6888, gallery@hawaii.edu)

Meet at Bank of Hawaii Center Breezeway, 8-10 a.m., free. JTB Hawaii, Inc. is hosting this Adopt-A-Block. Help cleanup up the streets of Waikiki.(343-0859)