The San Francisco chapter of Ikebana International will present its biennial exhibition from 10 a.m. until 4 p.m. in the Golden Gate Park. More than 100 arrangements will be exhibited, from classical to cutting-edge contemporary designs. The cost is $10 at the door and includes admission to 2 demonstrations daily. Demonstrations will feature arrangements from the Wafu, Aratame, Ohara, and Ikenobo schools. Info: www.ikebana.org.