This is a fun free community event. Last year Riley and I participated by leading an Art in the Park workshop with kids and adults. Lots of learning about Parks in the Northwest, bat caves to crawl through, gold to sift, and signing with Recyleman and the Dumpster divers! If you live in or near Portland/Vancouver you should go! 
Fort Vancouver National Historic Site is the gateway to the Pacific Northwest national parks and the only national park in the Portland/Vancouver metropolitan area. In the heart of the Vancouver National Historic Reserve, the National Park Service at Fort Vancouver invites its community to Family Day. FREE of charge.