Around the Bay Area and Marin check out these websites for some interesting garden (and other) related events.
SF Sierra Club Events
California Native Plant Society Events
Marin County Visitor’s Events
Pacific Horticulture Events
Marin ReLeaf Events
Marin Rose Society Events
Marin Photography Club
Marin County UC Extension Master Gardener- Community Service Events
Mediterranean Garden Society Events
Marin Society of Artists Events
Marin Art and Garden Center
Marin IJ Calendar of Events
Golden Gate National Parks Conservancy Calendar
The Garden Conservency
Marin Bonsai Club
Marin Magazine Events
Pacific Sun Events
Marin Organic Association Events
See Trees like this one at Marin ReLeaf’s fall color tour