Aerobic workout: 6 p.m. Mondays, Tuesdays and Thursdays, Kuhio School cafeteria. Costs $1. Call 735-5755 or 732-5118.
Oahu Choral Society: Rehearsals, 7 p.m. Mondays, U.H. Manoa's Music Department, Room 36. Call Joe McAlister at 595-0327.
Oahu Civic Orchestra: Rehearsals, 7 p.m. Mondays, Eiben Hall, Chaminade University. Call 261-6127.
Kodak Hula Show: 10 a.m. Tuesdays, Wednesdays and Thursdays. Free. Call 627-3300.
Na Leo Lani, Sweet Adelines: Women's barbershop group rehearses, 6:30 p.m. Tuesdays, St. Francis School. Call 373-3192.
Toastmasters: Practice speaking skills, noon Tuesdays, Net Cafe, Puck's Alley. Call Maggie at 941-9929.
Waikiki Singers: Rehearsals, 7 p.m. Thursdays, Waikiki Community Center. Call 922-7331.
Bach's Lunch: Free organ concert, noon Fridays, St. Andrew's Cathedral. Call 524-2822.
Royal Hawaiian Band: Free performances 12:15 p.m. Fridays at Iolani Palace and 2 p.m. Sundays at Kapiolani Park Bandstand. Call 527-5666.
Chess clubs: Chess Fans, 3 p.m. Saturdays, Harbor Center, Aiea; call Richard at 488-1221 or 456-0895. Mililani club meets 6 p.m. Mondays; call Guy at 625-2769.