Marin Audubon Hosts Field Trips for California Bird Atlas BIG WEEKEND. California Bird Atlas Big Weekend is a four-day statewide celebration of birds and the new California Bird Atlas – featuring dozens of field trips, and a collective mission to document as many species breeding in as many blocks as possible. Field trips introduce Atlas basics in the field, with leaders showing how to contribute. The goal is to make it easy for first-time participants to get involved and continue contributing beyond the weekend. Marin Audubon is sponsoring the following field trip for the CBA Big Weekend: San Geronimo Community Center environs Friday, June 5, 2026 9:00 AM-12:00 PM Birding with Liz Lewis and Susan Kelly REGISTER HERE Registration is required for this trip. Registration opens on Tuesday, May 26 at 8 AM Limit of 14 participants for this trip. On this trip we will be introducing the CBA and the breeding codes to those who are new to the Atlas. All experience levels are welcome for this easy, three miles roundtrip. We will meet in the parking lot of the former San Geronimo Golf Club now offices of Marin County Fire. There is a porta potty in the parking lot. We will hike the paths and grounds of the former golf course.