Learn about excavators or alpacas this weekend. Dozer Day encourages children to play in the dirt, as participants drive dozers, excavators and dump trucks with a professional operator, with proceeds benefiting children’s charities. The activities run 11 a.m. to 4 p.m. today and Sunday at the Clark County Fairgrounds, 17402 N.E. Delfel Road, Ridgefield. Admission is $10 to $13, $8 to $11 for seniors and ages 2 to 12, $6 for parking. http://vancouver.dozerday.org
The Sheared Delights Alpaca Fiber Festival opens up the farm gates, as visitors can meet alpacas and the local artisans who create items using fiber, with spinning demonstrations and more. The event runs 11 a.m. to 5 p.m. today and Sunday at White Oaks Alpacas, 39908 N.E. 12th Ave., Woodland. Admission is free. 360-263-7214 or www.whiteoakalpacas.com
The Vancouver Symphony Orchestra presents its final concert of the season, highlighting audience’s favorite pieces at 3 p.m. today and 7 p.m. Sunday. The concert also includes clarinetists Juanjo and Tolo Mercadal in a concerto by Franz Krommer at Skyview High School, 1300 N.W. 139th St., Vancouver. Tickets are $35 to $50; $30 for seniors, $10 for students. 360-735-7278 or www.vancouversymphony.org
The OMSI Traveling Science Festival features hands-on brain teasers that challenge brains of all ages, along with secrets of Pacific Northwest animals, dinosaur fossils, and space science. The public event runs 2 to 4 p.m. Thursday at Clearwater Springs Assisted Living, 201 N.W. 78th St., Vancouver. Admission is free. 360-546-3344 or www.clearwaterspringsseniorliving.com