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AT THE ARBORETUM

Folk Music Jams — Pull out your fiddles, guitars, mandolins, penny whistles, pipes, flutes, squeezeboxes — you name it! — and join your fellow musicians during the lunch hour for a little bluegrass, old-time, blues, Celtic, klezmer and other world music. All skill levels welcome. Listeners, too! Noon July 9 and 23, Wyatt Deck.

Tour — Meet the Mighty Oaks, in one of nation’s largest collections of oaks. This tour will highlight an astonishing variety of tree and leaf forms along the new Oak Discovery Trail. The guide will discuss oak ecology and the importance of oaks in human culture through time and around the world. 10 a.m. July 24, gazebo.

All events are free and open to the public. More information: (530) 752-4880 or (for directions, click on “Plan Your Visit”).