Meetup:
http://linux.meetup.com/cities/us/ca/palo_alto/events/
http://www.meetup.com/find/events/?allMeetups=false&keywords=Linux&radius=100&userFreeform=Palo+Alto%2C+California%2C+USA&mcId=c94301
http://www.meetup.com/find/events/?allMeetups=false&keywords=Linux&radius=50&userFreeform=94025&gcResults=Menlo+Park%2C+CA+94025%2C+USA%3AUS%3ACalifornia%3Anull%3AMenlo+Park%3Anull%3A94025%3A37.4484914%3A-122.18028119999997
http://www.meetup.com/silicon-valley-python/
http://www.meetup.com/SF-Bay-ACM/
http://www.meetup.com/svandroid/
http://www.meetup.com/rubymeetup/
http://www.meetup.com/sfpython/
http://www.meetup.com/SVPerl/
http://www.meetup.com/Silicon-Valley-Linux-Technology/
http://www.meetup.com/SF-Bay-Area-Large-Scale-Production-Engineering/ (LSPE)
http://www.meetup.com/SF-Peninsula-Raspberry-Pi-Interest-Group/
http://www.meetup.com/Bay-Area-SUSE-Meetup/
http://www.meetup.com/Docker-Networking/
http://www.meetup.com/Docker-San-Mateo-CA/
http://www.meetup.com/Docker-Mountain-View/
http://www.meetup.com/Docker-Santa-Clara/
http://www.meetup.com/indiebox/
http://www.meetup.com/The-Open-Source-Internet-Of-Things-Silicon-Valley/
http://www.meetup.com/sj-DevOps/
http://www.meetup.com/Cloud-Online-Meetup/
http://www.meetup.com/silicon-valley-python/
http://www.meetup.com/South-Bay-DC-NOC-DevOps-Infrastructure-Management/
http://www.meetup.com/LibrePlanetBay/
http://www.meetup.com/Bay-Area-Infracoders/
http://www.meetup.com/ConsoleOS-com-Official-Meetup/
http://www.meetup.com/Containers/
http://www.meetup.com/SVDevOps/

Ubuntu:
https://wiki.ubuntu.com/CaliforniaTeam/Projects/UbuntuHours
http://loco.ubuntu.com/teams/ubuntu-california/events/
http://loco.ubuntu.com/events/global/2979/