It's time for the Los Angeles Mycological Society's annual Wild Mushroom Fair. Bring the whole family and learn how to grow and cook mushrooms properly. You'll also pick up tips on how to properly identify wild mushrooms, and should you find any fungus in your back yard you can bring it for identification. There will be vendors with books, posters, mushroom kits, T-shirts and other mushroom memorabilia for sale. Los Angeles County Arboretum & Botanic Garden, 301 N. Baldwin Ave., Arcadia. 10 a.m. to 4 p.m. Sun. Free. (323) 292-1900. http://www.lamushrooms.org.