Folk Music Jam Sessions — 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 today (Jan. 21), and Fridays, Feb. 4 and 18, Wyatt Deck.

Twelfth Night — Presented by the Davis Shakespeare Ensemble in partnership with the Friends of the UC Davis Arboretum. Continues at 8 p.m. Thursday-Saturday, Jan. 20-23, and 2 and 8 p.m. Sunday, Jan. 23, gazebo — regardless of the weather (organizers said they are setting up heaters in the covered gazebo). See separate story.

Storytime Through the Seasons: Under the Persian Oak — All ages are invited to explore the natural and cultural world of the Middle East, and discover the diversity of oaks through hands-on activities. 2-4 p.m. Saturday, Jan. 30, gazebo (or 146 Environmental Horticulture in the event of rain).

Native Californian Elderberry Flute-Making Workshop —
Antonio Flores, East Bay Regional Parks docent, returns to lead another workshop on the Native Californian tradition of making flutes from elderberry wood — and to teach people how to play the flutes. All materials are supplied; please bring sharpened pocketknives. All ages are invited; adults must supervise their young children. No reservations needed. 1-3 p.m. Sunday, Feb. 6, 146 Environmental Horticulture.

Walk with Warren — With the arboretum's retired superintendent, Warren Roberts. Noon Wednesday, Feb. 9, gazebo.

Acacia Grove in Bloom — Brilliant yellow blooms and honeylike fragrance. 2 p.m. Saturday, Feb. 26, arboretum headquarters.

All programs are open to the public, and all are free except Twelfth Night. More information: (530) 752-4880 or arboretum.ucdavis.edu (for directions, click on “Plan Your Visit”).