Spring is a great time to introduce kids to nature. And the Call of the Wild Weekend offers an opportunity. A variety of activities are slated for the two-day event, which will be held at the Jack London State Historic Park in Glen Ellen. On May 20, the highlight will be Living with Wildlife on Oona-pa’is (Sonoma Mountain), which will be held 11 a.m.–2 p.m. and will feature a wildlife fair, speakers, family activities, and an exhibit of live birds. Then, on May 21, Plowing Play Day, tentatively set for 10 a.m.–4 p.m., will give kids the chance to see mules and draft horses, plowing and harnessing demos, spinning demos, and Early Day Gas Engines. There’ll even be free horse-drawn wagon rides. The day will also include family nature activities and crafts, and, for adults, wine tasting. Admission is $10 per car on May 20 and free on May 21. On both days, park visitors will get a chance to enter a drawing for a cruiser bicycle. For a detailed, up-to-date schedule, see tinyurl.com/4man2rf9.