SCRAP, the nonprofit SF "creative reuse center" that gives art supplies to teachers (and sells recycled items to use for crafts), is collaborating on an "Open MAKE" at the Exploratorium. They'll make Scrappy Sundials from repurposed materials.
When: Saturday, February 18, from 10-2
Where: Exploratorium, SF
Cost: free with Exploratorium admission
More info: Here or here