Sept. 24: Horticulturist Rachel Young demonstrates the practical uses of native plants for food, medicine and crafting as part of “The Garden Before the Gardens,” a daylong festival celebrating Native American heritage. Class 10 a.m. to noon, $10. Festival 10 a.m. to 4 p.m., included in regular admission of $3 to $8. Descanso Gardens, 1418 Descanso Drive, La Cañada Flintridge. (818) 949-4200.