From the City of Walnut Creek webpage:
Learn how to compost from certified Master Gardeners at a free 90-workshop sponsored by the Contra Costa County Solid Waste Authority from 7-8:30 p.m. Wednesday, Dec. 5 at the Heather Farm Community Center, 301 N. San Carlos Dr. The workshop will cover basic backyard composting, composting with worms, mulching and other topics. Reservations are required. 925-906-1801 ext. 306 orwww.wastediversion.org