ACCU Meetup  https://www.meetup.com/SFBay-Association-of-C-C-Users/
Bay Area Debian  http://bad.debian.net/pipermail/bad/  http://bad.debian.net/
BAFUG Meetup  http://www.meetup.com/BAFUG-Bay-Area-FreeBSD-User-Group/
BALUG  http://www.balug.org/
BayPIGgies  http://www.baypiggies.net/ 
BayLISA Meetup  http://www.meetup.com/BayLISA/
BerkeleyLUG http://www.berkeleylug.com/
Berkeley Pi Meeting  https://groups.google.com/forum/#!forum/berkeleylug
BUUG  http://www.buug.org/
CABAL  http://linuxmafia.com/cabal/
Cocoaheads  https://groups.google.com/forum/#!forum/cocoaheads---silicon-valley  
  http://cocoaheads.org/us/SiliconValleyCalifornia/
DVLUG  http://www.dvlug.org/
EBLUG  http://www.eblug.org/
Felton LUG   https://groups.google.com/forum/#!forum/felton-lug
NBLUG  http://nblug.org/
SF LUG http://www.sf-lug.org/
SF Perl UG  https://www.meetup.com/San-Francisco-Perl/  http://sf.pm.org/ 

Linux User Group of Davis (LUGOD) http://www.lugod.org/
Linux User Group of Sacramento (SacLUG) http://www.saclug.org/


Sites of sporadic interest:
https://www.google.com/calendar/embed?src=caj9iea2ol69b7n2uqdek4ocso@group.calendar.google.com&mode=AGENDA&gsessionid=OK
Elec. Flea Mkt. 2nd Sat. at De Anza, Mar-Oct: http://www.electronicsfleamarket.com/
Hacker Dojo Events http://events.hackerdojo.com/
Mozilla Conference  https://wiki.mozilla.org/DeveloperDays   (neglected since 2008)
Holidays, time changes!  see:  http://linuxmafia.com/bale/holidays.html
O'Reilly conferences,  https://www.oreilly.com/conferences/
Computer History Museum  https://computerhistory.org/events/
USENIX Association  http://www.usenix.org/events/  
Computers, Freedom, and Privacy  http://www.cfp.org/  (stopped at 2015?)
IEEE Security Symposiums  http://www.ieee-security.org/
Computer Professionals for Social Responsibility   http://cpsr.org/ (stopped at 2008?)
Vintage Computer Festival  http://vcfed.org/wp/  (August?)
Red Hat UGs https://red.ht/rhugs
Red Hat Events https://www.redhat.com/en/events
Noisebridge wiki pages but ignore the Maestro-related ones 
SVLUG  http://www.svlug.org/
BayThreat http://www.baythreat.org/ Early December conference
CA Ubuntu's List of LUGs  https://wiki.ubuntu.com/CaliforniaTeam/Projects/UserGroupContacts/Groups#SF


Dead groups:
BANG  http://www.bang.org/
BAWUG  http://www.bawug.org/ ]
CalLUG http://www.ocf.berkeley.edu/~linux/ http://callug.cs.berkeley.edu/ 
CCSF LUG mailing  http://hills.ccsf.edu/~pbuddebe/lug/
    http://www.ccsf.cc.ca.us/Organizations/Linux_Users_Group/ 
CSUEB LUG http://csueb-lug.blogspot.com/ last activity 2008 
Internet Developer/Technology Group  http://www.inetdevgrp.org/
LBNL LUG  http://lug.lbl.gov/
Linux Events  http://linevents.com/  (gone)
Linux Movies Group  http://www.linuxmovies.org/
Linux User Group Hayward (Linuxdojo)  http://www.linuxdojo.net/ 
Linuxstammtisch  http://electriclichen.com/linuxbierwanderung/local/#sanfrancisco
Oakland Perl Mongers  http://oakland.pm.org/  
PC Community Linux SIG - UG as a whole seems inactive after Sept. 2018
  http://www.pcc.org/index.php/special-interest-groups/296-linux-sig
PenLUG http://www.penlug.org/
SFBA NetBSD UG  http://www.imrryr.org/NetBSD/sfbanug.html 
SF OpenBSD UG  http://www.sfobug.org/ 
SCLUG  http://linus.got.net/
SF PostgreSQL UG  http://pugs.postgresql.org/sfpug/ last activity 2009 
sig-beer-west  http://www.extasia.org/sig-beer-west/
Silicon Valley Perl UG  http://www.rf.net/~sv-pm-org/ 
SJSU LUG  http://lug-sjsu.org/ http://groups.google.com/group/sjslug 
SlugLUG  http://sluglug.ucsc.edu/  
Smaug  http://www.scruz.org/ 
Sonoma County Sysadmins (SoCoSA) http://socosa.org/ 
Starship Augusta Ada  http://trek.starshine.org/  Down since 2009. 
SULUG  http://sulug.stanford.edu/ 
SVBUG  http://www.svbug.com/ 
SVWUX Silicon Valley Wireless Users and Experimenters  http://www.svwux.org/
WebGuild http://www.webguild.org/